ESF is typically heavily oversubscribed in June rankings. A lot changes from June to September, but students who are still interested in ESF can sign up on the waitlist. Be certain you've confirmed that the unique 7-unit schedule, including the Friday plenary lecture from 12:15-1:15, will work for you and fit with your other autumn plans!
For instructions on requesting ESF changes, or the link to the waitlist, please see here.
Non-ESF students may enroll in ESF 50 to receive one unit for attending all lectures.