The trip to Puerto Rico was meant to be a celebration — a long-awaited chance for Kevin Mares, a 25-year-old veterinary student from Queens, to see Bad Bunny perform live. Instead, it ended in tragedy.
Mares was fatally shot early Sunday in La Perla, a seaside neighborhood in Old San Juan that has struggled for decades with poverty and violent crime. He had traveled to the island with his girlfriend and two friends, attending the sold-out concert on Saturday night before heading to a nightclub…