I'm not sure about hosting the gathering, but depending on the date/time if no one wants to, I'll be glad to pitch in and help make it happen. I'll be cosplaying an Angel Variant of Petra Ral as well as her canon uniform version on another day at ALA.
Anime Expo 2014
Anime LA 2015
Tauriel // The Hobbit: DoS
Petra Ral // Attack on Titan
Petra Ral // Attack on Titan (Angel Variant)