In my day we had quite a mixture (self catering flat of about 8 year 1) so did not all get on that well. One girl hardly left her bed room all year until she dropped out at Easter as she and her boyfriend were in there most of the time taking drugs! I joined two university choirs. Some universities have choirs going at present (for those of us into that!) with distancing in chapels and the like. I did some hikes with a group at university too and perhaps things like country walks etc are still going on as outside? Not sure. Some universities still have team training and sports.
Noise was my worst thing and I told all my children take wax ear plugs - most important thing to pack. I had a poem published about noise in our student magazine although I would imagine a poem against noise at night leads to people waking you up more so I don't recommend others try that!
One of my sons went to university very quiet and requested a quiet corridor in halls and then decided to be sociable so in non covid days made friends with a different corridor and I am sure did wake up some quiet people on his corridor is wrong and bad in my view and he knows my views on noise at night. People should not be anti social.
It may be hard to move currently so sticking with teh 2 who are not drinking a lot, perhaps parents helping to buy particularly good noise cancelling headphones or Boots wax ear plugs which I use to this day if it's noisy, trying to go out each day even if just for a long walk with a flatmate, join any clubs that have outdoor things.
Sometimes it is an age thing. My twins being youngest of 5 used to older people and also almost oldest in the year were always more mature than others even at school. One this year is in Bristol still (post grad now) and was saying having people round for dinner is so much nicer than all the late night clubs they used to do which are not now possible - however this year only he and one other are in his flat (as they had to get it at the last minute in July after their gap year was cancelled) so that must be easier too. There were many more in shared houses in years 2 and 3.
The Catsmother daughter calling security at 12.30pm - very sensible. Unless people tell universities there are problems nothing will be logged and the universities will say we did not know.