Whoa, where did you go to school? This sounds like a teen dream weekend. Most of these things I think could be part of your regular wardrobe and can be interchangeable so you don't have to arrive at your event with a trunk full of clothes that you won't wear. And, yes, this is another "Quickfire Challenge" because I like to pretend certain parts of my life are like a game show. It's probably why I loved playing Supermarket Sweep with my sister when I was little.
Paisley Sarong and Tote $22.80, White House Black Market
Pool Party: A swimsuit, maybe a cute tankini since you're gonna be on the go all weekend, a sarong and some cute espadrilles. Perhaps a straw hat as well so you can protect your head and face from the crazy sun.
Wonderwoman Print Nightshirt $36, Topshop
Pajama Party: You could go either the normal way, with whatever pajama pants and band t-shirt you pulled out of your drawer last minute or you could get a pair of funny pj's, like a nightie with Wonder Woman on the front (appropriate!).
Flat Espadrille $9.99, Express
Lectures & Campus Walks: Something comfortable. I imagine you'd wear whatever you normally wear to this? I would split my outfits between comfy jeans or maxi skirts paired with light a light tee and the same espadrilles you wore to the pool. Those are kind of an all-weekend jam.
Sonic Youth Washing Machine Tee $20, Kung Fu Nation
Arts and Crafts: If you didn't wear a band tee to sleep then maybe this is a good time to wear it (if you don't mind getting it dingy that is) with jean shorts and, of course, the espadrilles.
Hope you have a blast!