There are two community events happening during the HP Discover 2011: Triple Crown Tweetup at HP Discover (Tuesday 7th June, 6-7pm), followed by the Triple Crown Community Party (Tuesday 7th June, 7-9:30pm). More information here.
Although they are hosted at the same venue you have to register for each event, as they are separate! Also the community party requires you to collect a wristband at the Discover Zone during the conference.
If you are using Twitter, you should follow @HPDiscover to find out more about the event, directly from Becca Taylor.
The Twitter hashtag for this tweetup is #TripleCrownTweetup.
Other related posts:
A HP Discover blog index
Cash for clunkers at HP Discover 2011
HP Discover 2011 Las Vegas LiveShare Stream