7 hours ago Celtics fans gather at Boston City Hall Plaza for watch party Banner 18 goes up in the air Tuesday as the Celtics face the Knicks to open the NBA season. US & World Videos 6:15 Celtics start season by raising Banner 18, blowing out Knicks 2:18 Hanson says Trump water tower dispute has cost taxpayers $3,600 2:10 Officials say plane's engine caused fire at Logan Airport 5:31 Celtics celebrate Banner 18 as they open NBA season against Knicks 2:18 Owners of historic Concord road fight to keep land private