<p>I believe NYU offers a certificate in creative writing. I know the New School has a program in screenwriting.<br>
I am not sure if you would be eligible to live in the dormitories for either of these programs.
Have you thought about applying to one of the summer writing colonies? They can run up to 2 months long and are very intensive.</p>
<p>UChicago has a program out of their continuing ed school.</p>