Just saw this on the Pinkbike homepage and I applaud them for taking a proper stance. I believe every MX site should have a similar notice. Go ahead, hate me if you want, but it's the right thing to do.
"NOTICE: Mountain biking irresponsibly during the COVID-19 pandemic puts you and others at risk. Riding injuries put unnecessary stress on medical systems that need all available resources to fight the virus, and group rides increase your chances of exposure. Please follow all local health authority directives, and DO NOT take risks.
Do not travel to other communities, especially smaller ones, as the health resources in those communities are already challenged."