Patrick MichelsTwestival volunteer Heather Buzzell could be tracking the charity money she just collected. Or she could be tweeting about it to her friends.About 200 cities around the world hosted Twestivals Thursday night -- part Twitter meet-up, part charity fundraiser -- and Dallas got in on the action with a party at Mockingbird Station. For three hours last night, local social networking all-stars paid a $15 entry to drink at Trinity Hall with like-minded microbloggers, catch a free Frost/N
