Dive bars close all the time, but you rarely hear about dive bars opening. Exception: Trina’s, a neighborhood hangout that retains the charmingly grungy appeal of predecessor Abbey Lounge. Trina’s low-key vibe pairs nicely with its unpretentious approach to cocktails: Keep them fun, keep them seasonal, and keep them anything but trendy. Launched back in 2009, this Cambridge favorite is perfect for crushing both mixed drinks and tantalizing comfort dishes ranging from crispy fried chicken and waffles to chili cheese dogs. After a few rounds, you can keep the party going just a few steps away at Parlor Sports, Trina’s sister property peddling local craft beer, classic pub fare, and a flock of flat screens showcasing all the big games.