O-week is really just a bludge week. It's meant to be a fun week before the
despair JOY that is university hits.
Joining clubs and societies is usually the main thing. But many first years also like to:
- go around and snatch as many freebies as they can (as mentioned above)
- actually ask the clubs and societies what's in it for them and what upcoming events they have
- go to some of the late night events, for examples karaokes/partying
A select few students also go to seminars during O-week. Not harmful, but usually a bit ceebs (given that it's fun outside).
Typically, people go to O-week for another day when they find out another event is being run another day, and they genuinely want to go to it. No obligation to though usually. (Going on 1 or 2 days tends to be the more dominating option. But some students who really want to go to many events do come in for a third.)
(I think I rocked up 3 days purely because I was bored at home. Only really needed to come for 2 days.)
It usually dims down during the week as well. Mon-Tues tend to be much busier compared to Thur-Fri. (Wed lies somewhere in the middle I think.)
Can't speak for Usyd but o-weeks can be somewhat course dependent. Some courses will have you come in for orientation sessions
Admittedly, orientation sessions are pretty much useless at UNSW.