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): ??% (Patterning) Katsucon 2017
- Female Kamui (Fire Emblem): 2% (Planning) MAGfest 2017
- Pyrrha Nikos (RWBY) Ver2: 56% (Weapon Work) Otakon 2016
- Honoka Kousaka [jester] (Love Live!): 10% (Planning) Otakon 2016