But I figured it couldn't hurt to look. I went to ticketmaster.com, and of course hadn't been there in so long that Safari didn't have a saved password for it! Had to use the "forgot" link. And then when I used their e-mailed link to reset my password, it griped that I had to set a new password that wasn't the same as the old one! Oh well. I guess I reuse that one a lot.
Apparently I bought tickets to the NCAA hockey regional in Worcester in 2002 and a "Lord of the Rings Symphony" show in Baltimore in 2004 on TicketMaster. Huh. My account shows one voucher that can be redeemed for two free tickets to a show. It might just take me a while to figure out what shows I could potentially see! There's a long list of eligible shows, but no way to search by state or region that I can see. Naturally.
Anyway, if you haven't already, you should go look, too.