Anyone going to WisCon can sign up to be on panels.
But today is the last day to do so. And signing up involves going through a longish list of panel ideas (using their newly revamped online system) and indicating which ones you're interested in, so it'll likely take some time.
So go do it!
Sorry for the short notice. Been meaning to post this for a week, but keep forgetting. Also been meaning to finish filling in my own programming form; I'd better go do that.