They have one every year at haloween, it's the second one i've been to, its called a haloween cruise organised by various car clubs in the midlands - midz modified and some others i think? the location is kept secret till the last minute, so people meet up to convoy at different locations and then get a text/call about the actual location and everyone convoys up. It was quite a sight though, the roads totally fully of modified cars- not seen that before, only on the way to things like Trax and Ford Fair.
But I think you have to be a member of certain car clubs and they then advertise it through there, year before it was in Cov so it will different again next year.