In the first half of the hour -- "Suddenly, Last Summer" -- the family is in the throes of summer activities: Phil and Claire are trying to orchestrate a kid-free week by coordinating Luke's camp with Haley's beach trip and Alex's volunteering excursion; Jay and Gloria are getting Manny ready for his first solo trip back to Colombia; and Mitch and Cam make it a summer to remember. In the second half-hour - "First Days" -- Luke and Manny have their first day at high school, which proves to be harder for Phil and Gloria than for the boys. Elsewhere, Claire makes her big return to the workforce at Jay's closet company and is a little rusty on her first day, and Cam starts a new substituting gig at the high school, leaving Mitch to try to juggle Lily's first day of pre-school and a very important meeting at work.

Cameron's older, single sister Pam is coming for a visit, and Cam is in a panic to hide the engagement until he can delicately break the news to her, but it turns out she has news of her own. Phil and Claire make a joint, guilt-ridden decision to miss one of Luke's volleyball games - that is - until one of them goes behind the other's back, and Gloria is in denial that she might need reading glasses.