During Grouplove’s first visit to BottleRock in 2013, frontman Christian Zucconi finished the group’s set, took off his shirt on stage, and then passed out. Whether it was the electrolytes or three more years of road experience, Zucconi and his bandmates played a super-enthusiastic set on day one of the 2016 edition of the Napa festival that kept everyone — lead singer included — on their feet, with highlights including Grouplove’s breakthrough hit “Tongue Tied” and an amped-up cover of the Beastie Boys’ “Sabotage.” “Well, she’s just 5 miles away,” said Zucconi, almost in a reassuring tone as Hooper noticed other parents who brought their babies to the festival.