Well, start by filling out the volunteer form for dpw, stating that you are available for that week or ten days after the burn. I suspect, but do not know, that the rather more stringent requirement that you have volunteered before you can get set up, do not apply. Although, I'm sure they'll get rid of you if you don't work hard.
At any rate, this is probably a question for a DPW volunteer coordinator, rather than a bunch of internet snarks.
Simon's real sig line?
Embrace the Sock