Items your guests can't simply buy: travel, dining and group experiences, signed memorabilia, art and services donated by your own community.
Aim for items from at least six different categories. Variety creates bidding momentum, because every guest needs to find something they want.
Exactly what's included, a written validity window, a usable photo and the fair market value, so you can set the starting bid. For memorabilia, ask for a certificate of authenticity.