Posted this in the Auction File Exchange today. Thought I had done it a while back, so if its a double.... oh well.
While making a recap sheet from our event I realized a lot of this info might help someone getting started. Hope it does! Its under auction - "How did you get all that stuff"
For Seattle Hotels We've gotten a few nights stay at Hotel 1000. I've heard of other fundraisers getting donations from the W hotel. The EMP donates tickets to nonprofits and that could be a cool addition. As for restaurants, it depends on the manager and the time of year. I contacted most of the places on Seattle Resturant Week because they tend to be higher end. Good luck!
For your DC Trip, try lodging in places just outside DC like Rosslyn, or Arlington VA. or Bethesda, MD They're right on the Metro line so convenient to most downtown DC attractions.