My business AbundantDesign.com is doing its second annual seed exchange on the 19 or 20th of March in Des Moines, IA. It was pretty small last year, a dozen or two attendees, but lots of fun and people have been asking if/when it will be. I have live music lined up for this year as well.
I've been thinking wouldn't it be cool to do a Skype call or NetMeeting, etc. between multiple venues around the country? Sort of like a big New Years Eve party, but for a New Season's Eve party!