Does anyone know when applications for summer residence are? I can't seem to find any information online. There's apparently a summer residence fair tomorrow, but again, I can't find anything.

You can always go to commons and ask the housing department

I know a lot of students place their houses/rooms for sub-lease in the summer. Since most kids go back home during the 4-month summer break, some other summer school kids, co-op students, or international students still need places to live. So perhaps you can ask one of your friends to rent you their house in the summer. It won't be a problem finding one, no one wants to pay for unlived 4 months rent. (I'm definitely sub-leasing my place in the summer, else it'll be throwing down $1600)