Just so you know, you're welcome to listen in on any of the guest lecturers that the clubs offer. You just can't eat the food if you didn't pay your membership.
As a first year, join one or two clubs, it'll be a great way to meet other pod folks too. Meetings are usually at lunch time, if that hasn't already been mentioned here, so it won't take too much of you time. Although by the end of your first year, there will be club elections that you might want to run for. Seems that if you want to run for any of the position, you want people to know who you are early on and the best way to do that is by showing your face often at club meetings.