Well I can't speak for all of Europe, but I am currently studying abroad in Austria, and pretty much if you wanna party every day, you can. There is always something to do every night of the week, including Sunday where I am from.
Also they tend to party to about 6 in the morning so they go a lot later then they do in NA.
I sometimes find it hard to talk to women due the language barrier, though they speak english, not always the best and can be hard to hear people sometimes or understand.
Everyone is super nice however, and I have only been here a few weeks and only now starting to have class with locals so hopefully get to know some of them and party with them, cause up till now most of the parties have been international students with a few locals.
so looking forward to the next weeks.
tl;dr - they party more often and much longer, not easy to hook up with, but may get easier as time progresses