We are near York and for us Mischief Night has always been (or since 1605 I suppose) 4th November ie the night that Guy Fawkes and his gang were making mischief and getting the gunpowder ready. But I see from a BBC article that for some parts of the UK it's 30th October, night before Halloween. The article suggested it harked back to times when 'mischief' was tolerated for a night I guess like the Purge but a lot tamer.
I distinctly remember being read the riot act in assembly that if anyone so much as dropped an egg and it transpired they were from our school there would be serious consequences. Shops would restrict the sale of eggs and flour in the run up (putting baking ingredients in the same category as knives and alcohol
). Thankfully it seems to not be such a thing in recent years but perhaps it's just the area.
Is it still a thing where you live and what day is it? I suspect it's more a northern thing but not sure what gives me that idea (maybe we are more unruly!)