Did you know there was a back entrance to Alumnae Hall?

One of the (few) advantages to taking kids to events, who are older than toddlers but don't have the attention span for much of anything else: about 10 years ago or more, I'd been around (including 'round back of) most all of our regular event sites. Doesn't mean I knew how to get there by driving, though the route you describe is probably about the only way it could be.