I'll be staying in Silverthorne the day before the car show. It's near Breckenridge and is on the way to Steamboat from Denver. Our company has a small condo on the North end of Lake Dillon that has a large picnic area on the shore, lots of parking, a hotel across the parking lot, and most importantly, a bar across the street!
If no one comes up with a better idea between now and then we can always use that area for a gathering.