Make Your Broadway Debut
 

Seems that the Actor Fund is having auctions to raise money for their cause. Two of the auctions will have the winning bid appear onstage on Broadway. Two shows have a bid going, Mamma Mia and Rent. Check it out:

Link to Mamma Mia Auction
Rent Auction

The Mamma Mia thing is for a walk on during the wedding scene. The Rent auction will actually have you singing onstage. I don't think I would be cruel enough to let thousand of people hear my horrible voice.