It's about time I set down the criteria for counting an event as an actual "convention." So here's what's required:
Must have a paid badge/Wriststrap.
Must have at least 1 major event (Cosplay, Karaoke, Etc.)
Must have panel/workshop programming.
Must have a dedicated Video and/or Game room
Must have Guests.
Must take place in a reserved venue (House parties don't count, otherwise there would be a lot more Anime Alpha's on this list.)
Bearing all that in mind: Lets see...
1996:
Katsucon
Otakon
AWA
1997:
Katsucon
A-Kon
AWA
Shore Leave
1998:
Anime Alpha
Katsucon
Nekocon
1999:
Katsucon
A-Kon
Otakon
Technicon
Animazement
Nekocon
2000:
Anime Alpha
Katsucon
Otakon
Technicon
Animazement
Nekocon
2001:
Anime Alpha
Ohayocon
Katsucon
Animazement
MTAC
Anime Central
AMA
Otakon
Nekocon
2002:
Ohayocon
Katsucon
Animazement
A-Kon
AMA
Otakon
Nekocon
2003:
Marscon
Katsucon
Animazement
AMA
Otakon
Nekocon
2004:
Ohayocon
Katsucon
AMA
Otakon
Anime Festival Orlando
Magfest
Nekocon
2005:
Marscon
Katsucon
CNU-con
A-Kon
Horrorfind
AMA
Nekocon
2006:
Marscon
Katsucon
AMA
Connecticon
Nekocon
2007
Marscon
Katsucon
AMA
Horrorfind
Nekocon
2008
Marscon
Katsucon
AMA
Horrorfind
Anime USA
Nekocon
2009
Marscon
Katsucon
Anime Mid Atlantic
Horrorfind
Nekocon
2010
Magfest
Katsucon
Chibi-con
Animazement
Anime Mid-Atlantic
Dragon*Con
Nekocon
Anime USA
Virginia Comic Con/AMA 1/2
2011
Katsucon
Anime Mid-Atlantic
Kaboombash
Dragon*Con
Nekocon
2012
Marscon
Katsucon
Anime Mid-Atlantic
Dragon*Con
Geek Media Expo
Nekocon
2013
Marscon
Katsucon
ShobouCon
MTAC
Full Moon Horror and Tattoo Festival
Anime Mid-Atlantic
Dragon*Con
Nekocon
Virginia Comic Con
2014
Magfest 12
Katsucon 20
ROFcon
ShobouCon
ODU Mini-Con
Ravencon
114 so far. I think I listed them all. If someone remembers one that I didn't list, let me know.
18 years of con going.