This traditional, end-of-summer event began more than 30 years ago when WEBN treated the tri-state to a fireworks show in honor of the radio station’s 10th anniversary. The party, held annually at Sawyer Point on Sunday of Labor Day weekend, has grown into an all-day affair with music, food and family fun and entertainment all day. On both sides of the river, nearly a half-million people view the choreographed Rozzi’s Fireworks show while listening to the soundtrack on WEBN (102.7 FM) starting just after 9 pm and lasting for about 30 minutes.