It may have been a private entity "leasing" the property, but it did so under the purview and with the consent of the City of Roanoke, it did not prohibit entry to unticketed visitors, meaning that the park and its premises were still open and accessible (unprohibited) to the general public.
Further, that would not reconcile the numerous falsehoods, improper assumptions of authority, negligence, ignorance, assault and battery undertaken by or in the name of the defendants. Further, the seizing of the plaintiff by the constabulary was made under false pretenses and without probable cause or reasonable suspicion. Since the park was open to the public, the "private security" could in no way eject a citizen from the grounds, as a public venue is a public venue regardless of the occupant or event.
I am frankly surprised at the very small amount being requested as compensation. I would have gone for the jugular myself.