If people-watching isn't what you had in mind, and you've already hit the Alley/Dealer's/Games room and done what you want there, play a game!
My con buddies always bring a deck of cards or two, and we've often made new friends by having others jump into the game!
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- Emperor Lelouch (Code Geass): 4% (Planning) Otakon 2015
- Hilda, Player Character (Pokemon Black/White): 32% (Sewing) Otakon 2015
- Magic Armor Link 2.0 (LoZ: Twilight Princess): 5% (Armor Revamp) Summer 2015
- Pyrrha Nikos (RWBY): 1% (Planning) Otakon 2015