I've heard about a few parties taking place via Twitter lately.
There was a birthday party that took place with Twit-vites and all..
Then I read an article by Jeff Houck who spoke to @DolceDebbie about her Twitter dinner party where they actually meet in person and used their Twitter names during dinner..
"As the 12 guests arrive, they introduce themselves first by their Twitter names. Although they have talked online, some for many months, it is a room full of familiar strangers meeting face-to-face for the first time."
Source - Tampa Tribune