The main act starting at 1:30 AM while (thinking of the US) a lot of people work weekends or even if they don't, their weekly schedule is 9-5 and so their sleep schedule is / should be like 12-7 is mad, it makes sense that going out matches more with that schedule so you don't get cicadean whiplash from doing night shifts over the weekend.
That said, in the UK for a good while now a lot of places are closed at midnight, on paper to prevent excessive drinking and nighttime troubles. In practice people just drink more and earlier in the day.
That said, in the UK for a good while now a lot of places are closed at midnight, on paper to prevent excessive drinking and nighttime troubles. In practice people just drink more and earlier in the day.