A group photo after a long day at Quassy. Credit: Laura Glesby Photo Eight yellow school buses full of New Haven families — 721 people in total — took a day trip to Quassy Amusement and Waterpark on Friday in honor of Juneteenth. “We don’t treat this day any differently than we treat the Fourth of July,” said Hill Alder Angel Hubbard, the field trip’s organizer. “We’re gonna do it with a bang.” Friday marked the second annual Juneteenth trip to …