Parties on campus are always held at one place: the Roundhouse. The Arc puts on start of session, mid-session and end of session parties every session (as you may have guessed), often with themes such as Arabian Nights, Casino Royale, Heaven & Hell, etc. or with bands such as the Midnight Juggernauts and Anberlin! There are also the annual Oktoberfest and Foundation Day parties, both of which are massive events happening in second session. If you're lucky (or unlucky, some may say), you may never look at lederhosen the same way again.
If you're looking for a bit more regularity, then Happy Hour at UniBar is 5-6pm, or Happy-2-Hours on Wednesdays 5-7pm. There are also weekly trivia, bingo and connect-4 competitions during session. Check out What's On in Blitz for more info.
During O-Week, there might be a couple of parties going on so check out the Night Events page for more info.
