Hey everyone, I'm new to this and have a question... I've decided to try and get Tom Petty's autograph for my dad via venue, and I'm shooting for sending him a letter to the Hollywood Bowl later in September.

I've read up on what exactly to include in my letter to increase my chances of him signing it, especially writing "Hold until [date of concert]" on the envelope. My question is what date I should write on it if he is playing that venue three different dates? His website says he will be there September 21, 22, and 25. Should I put down the latest one for good measure?
Thanks!