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Your uni might have a half-decent DJing society. Mine did, they used to run nights all over the city, they were excellent.
As far as sports go, the other lads are right that you should try something more obscure. Football and rugby are more or less a no-go unless you're actually good at them before you get there, that's universal across the country bar any intramural leagues (but you would need friends already to make a team).
Field hockey tends to be up there among the top "university experience" sports because it's fucking pointless so all they do is go out and drink, cricket is similar since you only get cricket weather in the three months you're not actually at uni, but cricket lads are about the biggest cunts you'll encounter at uni. American football is a decent shout if you're reasonable athletic to begin with.
I started ice hockey at uni and would recommend it to anyone provided they were happy with the investment money-wise and reasonably confident they're going to stick at it. The university league, BUIHA, has really good options for beginners, two non-contact leagues, both with a weekend-long tournament at Easter each year that involves a nice piss-up with players from the rest of the country.
Archery is also a good shout if you just want to make mates and not actually get good at a sport.