If it’s someone you care about, it’s probably better value for you to donate the cash value of a job instead.
Often times the silent auctions sell for less than the value of the good or service.
Example, you donate a $300 house wash voucher and it’s sells for $100.
You’re still doing $300 of work; but the charity onlt gets $100.
If it’s a cause you care about, skip the auction and just donate the cash. That’s my 2c.
I’m usually a bit short on cash, so Personally most of my charity thru work is actually free or discounted services. I look around my town for charitable organisations that own their own buildings and I’ll offer them my services. My fave is the men’s homeless shelter who get an annual building wash and a few Window cleans