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.
Fandom Fest 2014 cosplay: Kiki (Kiki's Delivery Service), Sayaka Miki [mermaid] (Madoka Magica)
MCM London Comic Expo cosplay: Kiki (Kiki's Delivery Service), Nagisa Momoe (Madoka Magica)
ALA cosplay: Kiki (Kiki's Delivery Service), Snow White (Zombie Panic in Wonderland)
2015 conventions: Anime Los Angeles, Anime Central, Japan Expo