Creative ideas to raise money during an auction???? -

So, my work is having a silent auction and in past years has done really well at raising money......but the last 2 years its gone really downhill. I work at a private childrens school and its really important we use the raised money for improvements to the schools program. We ve all been trying to brainstorm for some cool/unique ideas to have during this years auction that will help raise a decent amount of money but havent been able to come up with too much. Can anyone offer any inventive ideas please?

Auction a lunch with special people, such as local celebrities.

auction off some type of service a group of volunteers can perform