List only includes actual anime conventions I attended, it does not include other events, parties, or halloweens that I cosplayed at.
Convention
Date
Location
Costumes Worn
Ronin-Con
November 6th-7th, 2004
Norman, Oklahoma
Anime Princess Serenity (old version)
Mini-Con
April 9th, 2005
Broken Arrow, Oklahoma
Anime Super Sailor Moon (old version)
A-Kon
June 2nd-5th, 2005
Dallas, Texas

Thursday: Original Design Sailor Moon
Friday: Manga Eternal Sailor Moon and Fujiko
Saturday: Anime Neo Queen Serenity (old version)
Sunday: Anime Princess Serenity (newer version)
AnimeFEST
September 2nd-5th, 2005
Dallas, Texas

Friday: Usagi's Junior High Summer Uniform
Saturday: Classic Sailor Moon
Sunday: Elegant Gothic Lolita (EGL)
Monday: Casual wear
Cos-Con
November 4th-5th, 2006
Norman, Oklahoma

Saturday: Manga Sailor Moon
Sunday: Casual wear

Unnamed Con
April 21st-22nd, 2007
Norman, Oklahoma

Saturday: Manga Princess Serenity
Sunday: Casual wear

Conestoga
July 20th-22nd, 2007
Tulsa, Oklahoma
No cosplay sadly ;_;
Mini-con
August 4th, 2007
Tulsa, Oklahoma
Manga Sailor Moon
Anime Festival
August 17th-19th, 2007
Wichita, Kansas
Manga Neo Queen Serenity
Izumicon
November 2nd-4th, 2007
Oklahoma City, Oklahoma

Friday: Nami from One Piece
Saturday: Manga Super Sailor Moon
Mini-con 6.5
March 15th, 2008
Tulsa, Oklahoma
Gaara from Naruto
A-Kon
May 30th-June 1st, 2008
Dallas, TX

Thursday: Live Action Usagi's School Uniform
Friday: Nami from One Piece
Saturday: Nitara from Mortal Kombat
Conestoga
July 26th-27th, 2008
Tulsa, Oklahoma
Lee Loo from The Fifth Element
Tokyo In Tulsa
August 1st-3rd, 2008
Tulsa, Oklahoma

Friday: Guro Lolita
Saturday: Was Sick
Sunday: Gaara from Naruto
Tokyo In Tulsa
July 10th-12th, 2009
Tulsa, Oklahoma

Friday: Usagi's High School Uniform
Saturday Morning: Princess Serena from MLP
Saturday Afternoon: Manga Neo Queen Serenity
Sunday: Didn't go
Otakon
July 17th-19th, 2009
Baltimore, Maryland

Friday: Manga Sailor Moon
Saturday Morning: Manga Eternal Sailor Moon
Saturday Afternoon: ChiChi from Drangonball Z
Sunday: Original Design Kimono
AnimeFEST
September 4th-7th, 2009
Dallas, Texas

Friday Afternoon: Manga Princess Serenity
Saturday Morning: Manga Princess Serenity
Saturday Afternoon: Usagi's Middle School Uniform
Sunday Morning: Julia from Cowboy Bebop
Sunday Afternoon: Elegant Gothic Lolita
Monday: Casual Wear
Oni-con
October 30th-November 1st , 2009
Houston, Texas

Sadly, no cosplay, cuz my dumb self left my wigs at home, 9 hours away DX *epicfail*
Anime Matsuri
April 2nd-4th, 2010
Houston, Texas

Friday: ChiChi from Dragonball Z
Saturday: Elegant Gothic Lolita
Sunday: Casual Clothes
A-Kon
June 4th-6th, 2010
Dallas, Texas

Friday: No costume
Saturday Morning: Nami from One Piece
Saturday Afternoon: Princess Serenity
Sunday: Chii from Chobits
Tokyo In Tulsa
June 18th-20th, 2010
Tulsa, Oklahoma

Friday: Usagi's Junior High School Uniform
Saturday: Prisoner Usagi
Sunday: Didn't attend
AnimeFEST
September 3rd-6th, 2010
Dallas, Texas

Friday: Usagi's Junior High School Uniform
Saturday: Classic Sailor Moon
Sunday: Princess Aurora from Sleeping Beauty
Monday: Visual Kei