I stay somewhat inactive in the communities I'm in, because it's way too easy for me to get in way over my head with obligations.
So I'll be the one who shows up at random to events with enough food to turn the bbq into a Feast, run logistics, cook, and otherwise let the Hosts enjoy the show for a bit.
I keep full size candy bars in my bag at cons just to hand out to exhausted and hungry fursuiters.