Long Thai
The longest running anime convention in North America, A-Kon is held each June in the Dallas/Ft. Worth, Texas area. As one of the largest anime conventions in the country, A-Kon attracts a large number of amazing cosplayers to the Texas summer heat.
http://cosplay.kotaku.com/nice-cosplay-texas-1796275893
First held in 1990 with just 380 people in attendance, A-Kon was ranked the 2nd largest North American anime convention as of 2016 behind Anime Expo with over 30,000 attendees. While A-Kon is centered on anime and screenings of films and television series, many other activities take place encompassing various segments of geek and Japanese pop culture. These events include panels with cosplay guests, voice actors, meetups, authors and artists, a console and tabletop gaming areas, combat arts demonstrations, art shows, and concerts.
A-Kon returns in 2018 to Fort Worth, Texas on June 8-10, 2018.