Reader Matt Feldman of Yelo.us has pointed out a new feature in Places where Google is now integrating venue events into their Places Pages. It allows an individual to add the event data to their personal Google calendar and to “invite friends using the ‘Add to calendar’ link that appears alongside the event”.
Google has confirmed that they are adding these events to venues “in a few major cities across the globe, including New York, San Francisco, London, Paris (and others)” and this “information is based on data from rich snippets markup“.
Wcities and Zevents events use the RDFa based Open Graph data structure. Other events appearing on the National Museum of the American Indian Places page from NYC.com are sructured with the event microformat (vcard) formatting. Although it does not seem to matter which format you are using, if you are operating a local site that includes events and you want your event information included in Places, you should be formatting the data with rich snippets.
Google Places is Adding Upcoming Events To Venues via Rich Snippets by Mike Blumenthal