I don't have any specific hints, but there are a few that may be helpful in these threads and links. Some are specifically date auctions, but they could help with a "singled out" event.
Date auction at U collects thousands for tsunami relief
Fraternity hosts date auction to benefit Big Brothers and Big Sisters
bachelorette auction
Date Auctions -- Yay or Nay?
All GLO's auction?
auctions?
Also do a
Google News search for
"date auction"