does anyone go to any anime cons? if so which ones and have you ever cosplayed?

as for me i've gone to Ushicon 05 it was my first con and i didn't cosplay on that one, and my second and most recent was Ikkicon 07 and i cosplayed as Roxas from KH II complete with kingdom key!
at IKKICON 08 i plan to go as train heartnet but i have a problem creating hades, if anyone has any ideas on how to make one or even buy one just lemme know