When there's a space of time where there's nothing really going on (at least nothing I'm interested in), I'll take a breather in my hotel room and have a snack/watch some TV. At a convention I go to (Anime Crossroads), there's a courtyard where you can find people playing stuff like "extreme duck duck goose," which is fun, so maybe if there's an area like that, see what people are up to.
Finished: Armin Arlert, Mayoi Hachikuji, Tomoko Kuroki, Ultimate Madoka, fem!Masky
In progress: Kougyoku Ren, Lightning Farron
Upcoming cons: Sabakon, Youmacon, Con+Alt+Delete