The fest is always open, so you aren't in any hurry to swot up. If you have a fill (or a prompt) a year from now, it's A-OK :D

And I'm totally not just saying that because I want to swot up--there are awesome Barbara Gordon and Harley Quinn prompts, but I'm only familiar with them through the Batman: Arkham Asylum video game. Where they are both awesome, but still.