Is cosplay (dressing up in costume) allowed during the convention?
It’s not only allowed, it is encouraged! Like other fan events, InvaderCON looks forwards to seeing fans dressed up as their favorite characters from the Invader ZIM universe. You should not, though, wear costumes to the premium meal events (i.e. the breakfast and dinner) since that wouldn’t be appropriate. All costumes, though, are subject to convention center/hotel rules and local laws… i.e. weapons with sharp edges or realistic looking guns are not permitted, etc.