Anime Day Atlanta in May of 2012
This is a small one day thing that's pretty much a dealer room, video room, and a cosplay meetup. Still, for just a few dollars you can have some fun! They also have a few games and such too.
What made this one special was I took a Japanese girl to her first convention type thing before she had to go back to Japan. She loved it! I wish I could have gotten her to a different one!