BEGIN:VCALENDAR VERSION:2.0 PRODID:-//AIP Calendar//www.aip.de// METHOD:PUBLISH BEGIN:VEVENT SUMMARY:Colloquium | Tobias Buck (Heidelberg) DTSTART:20261119T133000Z DTEND:20261119T143000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2306 CATEGORIES:Scientific CATEGORIES:Generic Event CATEGORIES:Public CONTACT:Ewald Puchwein DESCRIPTION:Speaker: Tobias Buck (Heidelberg)\nTitle: TBD\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Kolloquium | Alice Quillen (University of Rochester) DTSTART:20260430T123000Z DTEND:20260430T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2347 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Ivan Minchev DESCRIPTION:Speaker: Alice Quillen (University of Rochester)\nTitle: Expre ssions of Resonant dynamics in Classical and Quantum systems\nAbstract: Al ice Quillen will illustrate rich connections between classical and quantum expressions of chaos\, adiabatic drift\, resonance capture\, sensitivity to control parameters and information loss. A method for predicting chaot ic behavior used in galactic dynamics and celestial mechanics has a quantu m equivalent. A sensitive classical chaotic perturbed system inspires a q uantum sampler. Quantum systems with divided phase space are described w ith a classical adiabatic limit and resonant capture probability but are a lways susceptible to transitions into superposition states.\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Alessandro Morbidelli DTSTART:20260521T123000Z DTEND:20260521T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2351 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Julián Alvarado-Gómez DESCRIPTION:Speaker: Alessandro Morbidelli (Observatoire de la Cote d' \;Azur | Nice\, France)\nTitle: Formation and evolution of a protoplanetar y disk: combining observations\, simulations and cosmochemical constraints \nAbstract: Observations of protoplanetary disks with ALMA have revealed a large diversity of properties\, but also some common tendencies in terms of dust/gas density and radial extension ratios\, as well as the appearanc e of features like rings and gaps or cavities. It is too late to observe t he proto-solar disk\, but many of its properties can be inferred from the current distribution of planetesimals and using cosmochemical constraints on the chronology of planetesimal accretion and the isotopic heterogeneity of the disk. I will review the available data which can be used to recons truct the proto-solar disk. The view that emerges is that of a quite stand ard disk of about 90 au in gas radius and 45 au in dust radius\, forming p lanetesimals at two distinct epochs (one of which very early\, while the d isk was presumably still in Class-0 or Class-1 stage) and evolving towards a transition disk at the appearance of Jupiter and Saturn. Similarities a nd differences with the PDS70 disk will be discussed.\nNote: Host: Oliver Gressel\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Serena Criscuoli DTSTART:20260618T123000Z DTEND:20260618T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2352 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Julián Alvarado-Gómez DESCRIPTION:Speaker: Serena Criscuoli (National Solar Observatory | Boulde r\, CO\, USA)\nTitle: TBD\nAbstract: TBD\nNote: Host: Meetu Verma\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Antoine Strugarek (CEA Saclay | Paris\, France) DTSTART:20261015T123000Z DTEND:20261015T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2353 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Julián Alvarado-Gómez DESCRIPTION:Speaker: Antoine Strugarek (CEA Saclay | Paris\, France)\nTitl e: TBD\nAbstract: TBD\nNote: Hosts: Ilaria Civale and Katja Poppenhäger\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Andrew Pontzen (Durham University) DTSTART:20261112T133000Z DTEND:20261112T143000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2359 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Ewald Puchwein DESCRIPTION:Speaker: Andrew Pontzen (Durham University)\nTitle: TBD\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Boris Gaensicke (University of Warwick | Coventry\, U K) DTSTART:20260924T123000Z DTEND:20260924T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2361 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Julián Alvarado-Gómez DESCRIPTION:Speaker: Boris Gaensicke (University of Warwick | Coventry\, U K)\nTitle: TBD\nAbstract: TBD\nNote: Host: Axel Schwope\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Tobias Buck (Heidelberg) DTSTART:20261119T133000Z DTEND:20261119T143000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2365 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Ewald Puchwein DESCRIPTION:Speaker: Tobias Buck (Heidelberg)\nTitle: TBD\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Dominika Wylezalek (University of Heidelberg | German y) DTSTART:20261203T133000Z DTEND:20261203T143000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2366 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Julián Alvarado-Gómez DESCRIPTION:Speaker: Dominika Wylezalek (University of Heidelberg | German y)\nTitle: TBD\nAbstract: TBD\nNote: Hosts: Tanya Urrutia and Guilherme Co uto\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Paul Groot (UCT/SAAO and Radboud University) DTSTART:20260625T123000Z DTEND:20260625T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2369 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Ivan Minchev DESCRIPTION:Speaker: Paul Groot (UCT/SAAO and Radboud University)\nTitle: Ultra-compact binaries and gravitational-wave progenitors\nAbstract: TBD\n Note: Host: Alex Schwope\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Eric F. Bell (University of Michigan) DTSTART:20260604T123000Z DTEND:20260604T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2370 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Ivan Minchev DESCRIPTION:Speaker: Eric F. Bell (University of Michigan)\nTitle: TBD\nNo te: Host: Roelof de Jong\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Heino Falke (Radboud University Nijmegen | The Nether lands) DTSTART:20261126T133000Z DTEND:20261126T143000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2373 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Ewald Puchwein DESCRIPTION:Speaker: Heino Falke (Radboud University Nijmegen | The Nether lands)\nTitle: TBD\nAbstract: TBD\nNote: Host: Christoph Pfrommer\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Thinkshop focused on the Magellanic Clouds DTSTART;VALUE=DATE:20270906 DTEND;VALUE=DATE:20270911 DTSTAMP:20260530T113743Z UID:www.aip.de-2388 CATEGORIES:Scientific CATEGORIES:Scientific Meeting CATEGORIES:Public DESCRIPTION: END:VEVENT BEGIN:VEVENT SUMMARY:AIP Seminar | Matthias Steinmetz (AIP) DTSTART:20260519T123000Z DTEND:20260519T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2396 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:AIP Seminar CONTACT:Marcel Pawlowski DESCRIPTION:Speaker: Matthias Steinmetz (AIP)\nTitle: How to get a billion dollar grant: The German Center for Astrophysics in Görlitz\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Colloquium | Marta Volonteri (IAP\, Paris) DTSTART:20261105T133000Z DTEND:20261105T143000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2406 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Ewald Puchwein DESCRIPTION:Speaker: Marta Volonteri (IAP\, Paris)\nTitle: TBD\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Jamboree of the AIP bodies (ISC) DTSTART:20260616T123000Z DTEND:20260616T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2413 CATEGORIES:Internal Event CATEGORIES:Institute Event CATEGORIES:Public DESCRIPTION: LOCATION:Maria-Margaretha-Kirch building\, campus Babelsberg END:VEVENT BEGIN:VEVENT SUMMARY:Jamboree (ISC) DTSTART:20261110T133000Z DTEND:20261110T143000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2414 CATEGORIES:Internal Event CATEGORIES:Institute Event CATEGORIES:Public DESCRIPTION: LOCATION:Maria-Margaretha-Kirch building\, campus Babelsberg END:VEVENT BEGIN:VEVENT SUMMARY:Career Event DTSTART:20261006T123000Z DTEND:20261006T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2415 CATEGORIES:Internal Event CATEGORIES:Institute Event CATEGORIES:Public DESCRIPTION: LOCATION:Conference room Maria-Margaretha-Kirch building\, campus Babelsbe rg END:VEVENT BEGIN:VEVENT SUMMARY:The Legacy and Future of Large Surveys: The Milky Way in Context DTSTART;VALUE=DATE:20260504 DTEND;VALUE=DATE:20260509 DTSTAMP:20260530T113743Z UID:www.aip.de-2426 CATEGORIES:Scientific CATEGORIES:Scientific Meeting CATEGORIES:Public CONTACT:Ivan Minchev DESCRIPTION:Conference at AIP\n LOCATION:Conference room\, Maria-Margaretha-Kirch building\, Campus Babels berg of AIP\, An der Sternwarte 16\, 14482 Potsdam\, Germany END:VEVENT BEGIN:VEVENT SUMMARY:SOLER User Workshop DTSTART;VALUE=DATE:20260630 DTEND;VALUE=DATE:20260703 DTSTAMP:20260530T113743Z UID:www.aip.de-2429 CATEGORIES:Scientific CATEGORIES:Scientific Meeting CATEGORIES:Public CONTACT:Alexander Warmuth DESCRIPTION: END:VEVENT BEGIN:VEVENT SUMMARY:Day of Open Doors at Telegrafenberg - Great Refractor and Einstein Tower DTSTART;VALUE=DATE:20260926 DTEND;VALUE=DATE:20260927 DTSTAMP:20260530T113743Z UID:www.aip.de-2430 CATEGORIES:Public Event CATEGORIES:Outreach Event CATEGORIES:Public CONTACT:presse@aip.de DESCRIPTION: LOCATION:Science Park Albert-Einstein\, Telegrafenberg\, Potsdam END:VEVENT BEGIN:VEVENT SUMMARY:Potsdam Day of Sciences 2026 DTSTART:20260509T100000Z DTEND:20260509T150000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2431 CATEGORIES:Public Event CATEGORIES:Outreach Event CATEGORIES:Public CONTACT:presse@aip.de DESCRIPTION: LOCATION:University Campus Golm\, Potsdam END:VEVENT BEGIN:VEVENT SUMMARY:Special Seminar | Dr. Sebastian Kamann (Liverpool John Moores Univ ersity) DTSTART:20260512T123000Z DTEND:20260512T130000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2446 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Special Seminar CATEGORIES:Galaxies\, Cosmology CONTACT:Peter Weilbacher DESCRIPTION:Speaker: Dr. Sebastian Kamann (Liverpool John Moores Universit y)\nTitle: Wempe lecture 3 “Young massive star clusters: Treasure chests of stellar evolution”\nAbstract: The colour–magnitude diagrams (CMDs) of star clusters underpin stellar astrophysics. They calibrate stellar ev olution models\, enable age-dating of stellar populations\, and provide te mplates for interpreting unresolved galaxies. Yet the CMDs of young massiv e clusters show surprising features\, such as split main sequences and ext ended turn-offs. This raises the question of whether we truly understand t he mechanisms governing stellar distributions across the CMD.\nIn this tal k\, I will show how binary interactions and stellar rotation reshape CMD m orphologies. Using observations of young massive clusters in the Magellani c Clouds obtained with HST and MUSE\, we measure the spin velocities of la rge stellar samples and characterise the clusters’ binary populations. O ur results reveal distinct populations of slow and fast rotators occupying different loci in the CMD. The detection of post-interaction binaries\, s uch as blue stragglers and stripped stars\, further enables us to constrai n population synthesis models and to assess the contribution of massive st ar clusters to the cosmic rate of compact binary mergers observed via grav itational waves.\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:AIP Seminar | Junais (AIP) DTSTART:20260609T123000Z DTEND:20260609T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2467 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:AIP Seminar CONTACT:Marcel Pawlowski DESCRIPTION:Speaker: Junais (AIP)\nTitle: Identification and characterisat ion of dwarf galaxies from Euclid observations using foundation models\nAb stract: tbd\n LOCATION:AIP\; Kirch building\, Conference room\nZoom link: https://eu02we b.zoom-x.de/j/3620884100 END:VEVENT BEGIN:VEVENT SUMMARY:AIP Summer Party (internal) DTSTART:20260701T130000Z DTEND:20260701T160000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2468 CATEGORIES:Internal Event CATEGORIES:Institute Event CATEGORIES:Public DESCRIPTION: END:VEVENT BEGIN:VEVENT SUMMARY:Songs under the Starry Sky DTSTART:20260605T173000Z DTEND:20260605T200000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2472 CATEGORIES:Public Event CATEGORIES:Outreach Event CATEGORIES:Public CONTACT:Axel Schwope DESCRIPTION:Beneficial concert in the Great Refractor on Telegrafenberg wi th Axel Schwope as solist. Adminission only after prior registration.\n LOCATION:Great Refractor\, Telegrafenberg\, 14473 Potsdam END:VEVENT BEGIN:VEVENT SUMMARY:4MOST All Hands Meeting DTSTART;VALUE=DATE:20260601 DTEND;VALUE=DATE:20260606 DTSTAMP:20260530T113743Z UID:www.aip.de-2490 CATEGORIES:Scientific CATEGORIES:Scientific Meeting CATEGORIES:Public DESCRIPTION: END:VEVENT BEGIN:VEVENT SUMMARY:Special Seminar | Nic Scott (Georgia State University (The CHARA A rray)) DTSTART:20260713T090000Z DTEND:20260713T100000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2497 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Special Seminar CATEGORIES:other topic CONTACT:Kalaga Madhav DESCRIPTION:Speaker: Nic Scott (Georgia State University (The CHARA Array) )\nTitle: Recent technical and scientific highlights from the CHARA Array\ nAbstract: The Center for High Angular Resolution Astronomy (CHARA) Array is a six-element interferometer at Mount Wilson Observatory with baselines ranging from 34 to 331 m. The Array hosts a number of new or upgraded\, s ix-telescope beam combiners that span the spectrum from the visible R-band to the near-infrared K-band with a range in available spectral resolution . The most recent are the Silmaril beam combiner that is a three-telescope instrument for H- and K-bands that is designed for very high sensitivity on fainter targets and the CHARA Array Integrated Optics Testbed (CHARIOT) that is a platform for characterizing integrated optic combiners. A seven th\, mobile telescope is now on-site for use with fiber optics for H-band beam transport. The mobile telescope will extend the baseline range from 2 0 m to 579 m\, creating new opportunities for measurements of stars with l arge and small angular diameters. Observing time is available to the commu nity through a program funded by NSF. The observing programs are solicited and peer-reviewed by NSF's NOIRLab.\nAbout Dr. Scott:\nNic Scott is the T elescope Systems Scientist at the Georgia State University Center for High Angular Resolution Astronomy (CHARA) Array. Nic directs all aspects of co ntrol and development of the telescopes\, enclosures\, and relay optics of the seven CHARA Array telescopes. Nic received dual PhD degrees from Geor gia State University and the Observatoire de Paris for his work on a novel fiber optics beam combiner at the Array. Prior to his current appointment at CHARA\, Nic was a Lead Research Scientist at the NASA Ames Research Ce nter where he developed speckle interferometry cameras for the WIYN\, Gemi ni-North\, and Gemini-South telescopes. Nic is currently leading the integ ration of the CHARA Array Integrated Optics Testbed (CHARIOT) experiment t o provide a flexible station in the beam combining laboratory to character ize novel integrated optics combiners.\nNote: Let me know if you want to m eet Nic. He will be at AIP until 14.05.\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:Virtual Babelsberg Starry Night DTSTART:20260521T180000Z DTEND:20260521T190000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2498 CATEGORIES:Public Event CATEGORIES:Generic Event CATEGORIES:Public CONTACT:presse@aip.de DESCRIPTION:Talk (in German): Artemis II - To the Moon and back (Mirko Kru mpe)\n LOCATION:The talk is going to be available via the YouTube channel Urknall \, Weltall und das Leben. END:VEVENT BEGIN:VEVENT SUMMARY:Leibniz Academy Follow-up Workshop 2-10-25 DTSTART;VALUE=DATE:20260930 DTEND;VALUE=DATE:20261002 DTSTAMP:20260530T113743Z UID:www.aip.de-2500 CATEGORIES:Scientific CATEGORIES:Scientific Meeting CATEGORIES:Public CONTACT:Hakan Önel DESCRIPTION: LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP)\, Research campu s Babelsberg\, Maria Margaretha Kirch Building END:VEVENT BEGIN:VEVENT SUMMARY:Virtual Babelsberg Starry Night DTSTART:20260618T180000Z DTEND:20260618T190000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2502 CATEGORIES:Public Event CATEGORIES:Generic Event CATEGORIES:Public CONTACT:presse@aip.de DESCRIPTION:Talk (in German): Licht lesbar machen (Daniel Sablowski)\n LOCATION:The talk is going to be available via the YouTube channel Urknall \, Weltall und das Leben. END:VEVENT BEGIN:VEVENT SUMMARY:AIP Seminar | Kaffeerunde (AIP) DTSTART:20260707T123000Z DTEND:20260707T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2503 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:AIP Seminar CONTACT:Marcel Pawlowski DESCRIPTION:Speaker: Kaffeerunde (AIP)\nTitle: Kaffeerunde\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:AIP Seminar | Geraint Lewis (University of Sydney) DTSTART:20260616T123000Z DTEND:20260616T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2504 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:AIP Seminar CONTACT:Marcel Pawlowski DESCRIPTION:Speaker: Geraint Lewis (University of Sydney)\nTitle: Confront ing the Cosmological Principle: How secure are the foundations of the cosm os?\nAbstract: For nearly a century\, the cosmological principle has been the bedrock of our understanding of the universe. But what if this foundat ion is starting to crack? In this talk\, I describe how we have used quasa rs and radio galaxies to test the assumption that the cosmos is isotropic and homogeneous. We know that the Cosmic Microwave Background displays a s trong dipole\, attributed to our motion relative to the local Hubble flow\ , and if this motion truly defines our cosmic frame\, its imprint should a ppear elsewhere. Indeed\, we find a dipole in large-scale surveys of cosmo logical sources\, and whilst the direction agrees\, the amplitude does no t\, diverging sharply from expectations based on the CMB. I will explore p ossible explanations for these tensions and ask whether they signal new ph ysics or a fundamental shift in our cosmological worldview.\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:AIP Seminar | Dr. habil. Anne K. Krüger DTSTART:20260527T123000Z DTEND:20260527T133000Z DTSTAMP:20260530T113743Z UID:www.aip.de-2505 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:AIP Seminar CONTACT:Meetu Verma DESCRIPTION:Speaker: Dr. habil. Anne K. Krüger (Forschungsgruppenleitung "Reorganisation von Wissenspraktiken"\, Weizenbaum-Institut e.V.)\nTitle: Generative AI in science - How does it change scientific practice?\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT BEGIN:VEVENT SUMMARY:EPIC Technology Meeting DTSTART;VALUE=DATE:20260608 DTEND;VALUE=DATE:20260610 DTSTAMP:20260530T113743Z UID:www.aip.de-2506 CATEGORIES:Scientific CATEGORIES:Scientific Meeting CATEGORIES:Public DESCRIPTION:EPIC Technology Meeting on Photonics for Space and New Space a t AIP\n LOCATION:Kirch building\, conference room\, AIP campus Babelsberg END:VEVENT END:VCALENDAR