Fans of Two Boots’ cornmeal-crust pies can celebrate its quarter-century birthday with a Summer Stage concert copresented by Two Boots itself. The evening features music from the African pop group Sierra Leone Refugee All Stars, the marching band Himalayas and bluesy trio the Whiskeyhickon Boys. Enter a raffle for a year’s supply of free pizza—proceeds go to the Lower Eastside Girls Club—and snack on free samples of Two Boots specialties like the Newman (sopressata and sweet Italian sausage) and the Larry Tate (spinach, plum tomatoes and garlic). Free. All ages.