Of course he's having alcohol there, probably playing that drinking version of ping pong too. The shit I've done at other households would mean I'd never trust more than 5 other people in my gaff at anyone time.

Ok instead of ruining his upcoming night here's some advice which I'm sure you'll already know but there's no harm in it being repeated:

Have fun, drink but try and be more sober than the guests, the last thing you need is passing out whilst everyone is headbutting the mirrors.

Hide the valuables and try to keep at least one room off limits - preferably your ma and pa's. Absolute no no in there - though some will try. Also try creating a lot of space with less obsticles for drunks - furniture to the walls, removing tables etc.

The bath is a good place to keep a lot of beer cold if you prepare well enough with plenty of ice and cold water. But you end up with people stealing it.

I know I'm a hypocrite and hardly one to say this but seriously keep drugs to a minimum. The last thing you need is a neighbour calling the cops, getting raided and then telling your olds drugs were involved.