Also, since you mentioned your son is in physics, keep an eye on this calendar for events (they will start loading it up closer to end of August) http://umdphysics.umd.edu/events/calendar.html#year=2017&month=7&day=23&view=month
He should also look into research opportunities as an undergrad - lots of cool stuff going on http://umdphysics.umd.edu/academics/undergraduate/ugrad-research-opportunities.html
and read this also http://umdphysics.umd.edu/academics/undergraduate/ugrad-events.html