Look around your house for some old, funny, or awful white elephant gift. Don't spend money, just wrap something and bring it along to the party. I've seen some real hum-dingers over the years, but the best was a bowling ball that had been used as a landscape ornament for 30 years. It was ... heavy and "lovely."
See ya Saturday!
PS My condolences to the Honor Band and ACT participants. Such a bummer. We will think of you as we whack each other, I promise. And we'll do another party when more people can come.