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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- Rose Lalonde "Glow" Tier (Homestuck): 95% (Detailing) Otakon 2014
- Fancy Mewtwo Gijinka (Cowslip Gijinka): 3% (Planning) Otakon 2014
- Secret Cosplay (???): 1% (Planning) Katsucon 2015
- Magic Armor Link (LoZ: Twilight Princess): 15% (Patterning) MAGfest 2015