Proof of membership for Sunday 8/13 DE

Okay, so I'm a little late on this issue since I don't think I've driven in a "Q" event since we started the "proof-of-membership" thing (last year?).
Now that I've finally got my car back for driving, what do I need to do to confirm the status of my membership and how can I get proof of membership in time to drive on Sunday, 8/13? (I don't suppose that the address label from the current "Witness" will do. But, how about the label and my passport?)
Now that I've finally got my car back for driving, what do I need to do to confirm the status of my membership and how can I get proof of membership in time to drive on Sunday, 8/13? (I don't suppose that the address label from the current "Witness" will do. But, how about the label and my passport?)