Unfortunately, it is what children do, but 10pm. Not funny.
Did the police come?
We took a school trip out once, all dressed as evacuees, and walked through a lovely lane with beautiful large front doors and knockers. Of course, they were knocked. Trying to exert authority dressed in a headscarf turban, dungarees and wellies (me), and a schoolboy, (him ) was not easy, and of course the culprits were two very well-behaved little girls who were terrified we would tell their mothers, who were both TAs at the school. (We never did).
Which is no help to you, but don't be surprised if the knockers turn out to be someone totally unexpected.
Doorbell camera?