I really want to be more active in Fandom At Large, and participate in more things, but I usually decide against it after looking over my List. It's kind of a combination "what would I have to NOT be working on to do this," "have I written for this fandom/character before,","when was the last time I managed to write [whatever the wordcount minimum is] in [# of days before the deadline]," and "how many other people are already signed up?"

Usually, though, I make a note of the timing somewhere so that I can stick a reminder on a calendar and try to give myself more wiggle room next year. (This only sometimes gets confusing, as I'm then like, "wait, is Rhodeyfest in October or July?? There were posts about both!")