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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- Suzuha Amane (Steins;Gate): 95% (Final Details) Katsucon 2015
- Magic Armor Link (LoZ: Twilight Princess): 22% (Patterning) Katsucon 2015
- Human Beatrice (Over the Garden Wall): 29% (Sewing) Katsucon 2015
- Emperor Lelouch (Code Geass): 2% (Planning) Spring 2015