Reps for Graton Rancheria say that the 4,000-person party will effectively limit capacity at the casino - with total capacity apparently being 20,000. The casino and resort has remained opened despite the fact that Sonoma County never left the state's 'Purple' tier for COVID spread, and it is technically supposed to be operating at 20% capacity. And while county health officials are not happy about it, they can't do anything to stop it. The Graton Resort & Casino in Sonoma County, which is on the sovereign land of the Federated Indians of Graton Rancheria, is hosting a 4,000-person private event on New Year's Eve.