The last nct bus back into town from the wollaton village side of the park will be 22.19….not sure about the Derby Rd side, or from Middleton Boulevard.
It looks like the last rainbow2 from the Wheelhouse is 11.16pm
The Lime Tree Avenue car entrance-exit will probably be the last to close and from there its a short walk to the bus stops opposite the Queens Med where there are probably more frequent and later buses (they are all on Sunday timetables on Bank Holiday Mondays, Tuesday is supposed to be a saturday timetable).
Check the timetables and twitters.
Car Parking looks like Lime Tree Ave entrance too, and its a paying car park for the Motorshow-Autocarna there doesnt seem to be any specific Monday evening Beacon info except it starts at 7.30, with the beacon lit at 10pm. The Autocarna stops at 5pm…but whether any marquees close then isnt on any web info.