A tipster directs us to the following (yes, yes, it's for charity, we're terrible for making fun, etc.) opportunity on eBay:

The bidding is currently at $12.50, which is a bargain. If you win, try and make sure you get to go on Build Your Own Taco day. It doesn't get any more fun than that.

Lunch @ Gehry-design Conde Nast Cafeteria w/top mag ed [eBay]