That's something, but the virus lingers in the people that remain behind. Bars and hotels and all the other business necessary to support such a large endeavor require legions of people to operate, and many of the workers are local to Sturgis or, like a younger me, brought in from neighboring communities.
I mean, there's nothing really there to support all these people, it has to be brought in. The place I worked was a cow pasture for the rest of the year. We cut down the grass, marked out RV spots with spray paint, and set up masses of stages and food stands and all the other things necessary for human life. It's a manpower heavy endeavor, and even then, the people live in filthy conditions for the duration.
I fully expect that Sturgis will be a stand-out hotpot for Covid in the region after the rally. I would love to be wrong about this.