I haven’t read the thread, but this might have some helpful advice for you: The Do's and Don'ts of Packing for College
I’ve not used one, but I’ve heard good things about people using personal neck fans to deal with some of the summer’s extreme heat. As you’ll be lugging all your stuff around and dealing with crowds of others doing the same, I could see the benefits of having one. Here is one example from Amazon.
Enjoy your travels and the rest of your summer!
/Sincere