Some friends of mine rode at Kittatiny last night (Weds 7/6) and said all the parking lots were blocked off. There was no 'public' parking area open. (They had parked in an 'alternative' area which somehow did not get blocked off.) I suspect the main entrance to Deer Park will likely be closed unless this budget situation magically gets resolved between now and Saturday.
You could probably still ride at Deer Park, but you might want to find somewhere else to park.
Idea: After exiting Route 80 onto Rt 517 (heading South towards Hackettstown), there's a shopping area which includes the 7-11, a gas station, and a pizza place. From there, the street entrance to Deer Park is only 1 mile down the road. Maybe you could park by the 7-11 and then ride into the park. (?)