This year's auction, inside the Sioux City Convention Center, has a masquerade theme.
There will be a variety of live, silent, and super silent auction items to bid on, everything from signed jerseys, to trips, wine, and outdoor decor.
This is the biggest fundraiser of the year for the Bishop Heelan Catholic Schools.
Equipping the new high school building makes this year's fundraiser especially important.
"As you know we have the new Bishop Heelan Catholic High School that just opened in January. And we want to equip the science labs with new equipment but we also want to support our junior high schools with the science equipment that is needed in those areas as well," said Mark Petty, Co-Chair Heelan Auction.