BOSTON —Here are firework displays being held in Massachusetts communities for the 4th of July. Note: Some shows may be cancelled due to weather – so keep an eye on the weather report! June 30 Dracut – School Complex at the Gazebo – 9:00 p.m. Somerville – (rain date 7/7) – Trum Field – 9:15 p.m. July 1 Auburn – (rain date 7/2) – Pappas Recreation Complex – 9:30 p.m. Harvard – (rain date 7/8) – approx. 9:15 p.m. Mashpee – Mashpee High School – Dusk Northbridge – (rain date 7/8