[X] Try to talk to Detective Murphy about providing security
The US has a system of renting cops in their off hours to act as security while they maintain their authority as police officers. There is zero harm in asking and between the two of us we could afford to just straight up pay a couple of off hours officers in the know to walk the perimeter and keep out troublemakers.
Like, this isn't even unusual save for the supernatural element. My highschool years and years ago rented a cop to do security for after hours events. It's absolutely a normal thing to ask. Worst case nobody has time and it IS a voluntary ask for the officers in question, but SOMEONE is looking to make extra money on the side. The US doesn't pay our beat cops enough for nobody to want that extra cash.