Crist, I was just on the City of Dallas site and the Park Department site. There is no mention of the park being closed. What I found was that organized sports (soccer games) were shut down, but it also said parks, athletic fields, and tennis courts are OPEN. I would go fly until you are kicked out. I may not fess up to being a club member if they ask, though. Don't want to get the club in trouble.
Bill