I rode one of the Dempsey Challenge rides today, it was honestly one of the most enjoyable group rides I’ve done on Zwift. They are trying to get to 25,000 total participants in the events to unlock $25k for the Dempsey Center for Cancer; plus you can donate additionally. A good cause. If you ride one of the events, you unlock a jersey. Who can’t use another jersey in their garage?
One benefit in the rides is you get to ride the new S Works SL7, which seems like a pretty sweet bike in Zwift, fast. Kind of like try it before you buy it.