So I can't advocate playing disc golf in the park after closing, but if I was going to I'd try to get people together on a date close to a full moon. If it is overcast it ends up not mattering, but on a clear night it can help a lot. The next full moon is Saturday, March 19, so that Friday or Saturday could be a target date if I was advocating such a thing, which I'm not. It is between St. Pats and Spring Break, so the UMR guys would be able to make it. Sunset on March 19 is 7:18pm so if you were going to do such I thing you could start at 7:30pm, play one round of 18 at be gone by 9:30pm. Not that I think anyone should.
Of course even if I did want to trespass in the park after dark, I can't be there since I work both Friday and Saturday nights. So all this information is purely hypothetical.