Yeah you've already missed some big ones, but there are heaps throughout the year
Just join the groups on facebook and they'll keep you updated
Science Student's Society:
http://www.facebook.com/groups/2392884817/?fref=tsJoin the group and you should be invited to all of the events
Foam Party is tomorrow night, but tickets have been sold out.
They usually have bbqs each fortnight, have regular pub nights and are responsible for kegs 'n' sun among other things
Boat Cruise, Science Ball and EOX (End of exams party, runs each semester) are the bigger events that are yet to happen
Membership is $5 and is completely worth it cause of all the free beer, food and discounted ticket prices
Arts Student's Society
http://www.facebook.com/melbourneartsstudentssocietyThat will keep you up to date on all of the events
http://www.facebook.com/artemis.prime.52?fref=tsAdd the mascot^ if you want facebook notifications and invitations for each event
Week 3 party obviously already passed, asides from that there are also regular bbqs every 2-3 weeks
There's also a 'Paint and Glow' party which is a pretty big event in semester 2
There will be a MAX party (another end of exams party, runs each semester) and Arts Ball in semester two
There will probably be a few other events throughout the year as well
Membership is $2, same perks apply
Usually EOX is better than MAX, but Arts ball (in the past) has been better than Science Ball, but they all run on different nights so YEAH
University of Melbourne Student Union Activities
http://www.facebook.com/umsuactivities?fref=tsThey hold a BBQ every Monday and Tuesday at North Court from 1pm. Monday's usually have some local or small time band lined up, but on Tuesday's you'll find bands like Snakadaktal, Evermore, Alpine, Washington and a bunch of other pretty well known bands
They're responsible for the Start of Uni Party (happened a few weeks ago) which is definitely one of the best nights in the uni calender
They host trivia nights with really cheap drinks (more enjoyable than you'd think), cocktail parties, Oktoberfest and Prosh Week.
Prosh week, if you choose to get involved in that sort of stuff, will be the most ridiculous, yet most enjoyable, week of your life. I can't stress this enough. It's the kind of stuff you might see in movies. Just a bunch of nudity and ridiculous activities and stunts occurring through out the week.
Membership is compulsory, so you may as well take advantage of all the stuff that's on offer.
Those are the three ones I pay most attention to
There's also the Melbourne University Engineering Students Society, which is another big one
http://www.facebook.com/MUESC?fref=tsThey run stuff like Beer and Chips and other BBQs, have boat parties and have an Eng ball like the Science and Arts societies. They don't have as many events, but membership is a gold coin donation and it has a bunch of perks.
There's the Commerce, Environments and Biomedicine societies.
Commerce - I hear - don't really do as much as the other societies, but they're events are easily the classiest. Haven't heard of a single BBQ (I'm sure there are some), but I hear the boat parties and the Commerce Ball are much fancier than the ones run by any other society.
http://www.facebook.com/cssmelb?fref=tsEnvironments (ENVI)
http://www.facebook.com/#!/envi.ess
Really know nothing at all about this one, sure they have all 'normal' events
Biomedicine
http://www.facebook.com/biomedbear.unimelb?fref=tsAgain, there are BBQs, Biomed Ball etc etc
Less events than the ones offered by Arts and Science societies though
There are a bunch of other smaller ones that are pretty good for socialising as well.
If you like beer, for example, there's this:
http://www.facebook.com/pages/More-Beer/277528742316442?fref=tsIf you like politics
http://www.facebook.com/groups/polintsoc/?fref=tsThey have 2 hour sessions each week where you sit in a circle and talk about a whole range of social and political issues, then they go to the Clyde for free food and drinks
BUT YEAH
If you were looking for places to socialise, thennnnn^^^^^^^^^^