While watching the fireworks on july 2nd, 2019 at the fireworks show at "july in the sky - henry park vernon ct and downtown rockville ct, i noticed a very large bright white "star" in the sky to the top right of the fireworks that were going on. i told my friend to look up and then others heard and looked up as well. there was a huge white circle/sphere in the sky and then after about 30 seconds it disappeared completely. then a minute later it popped up again same spot. the grand finale began for the fireworks show. then it disappeared once more after about the same duration time 30 seconds of visibility. i kept looking and couldn't believe what i saw so i continued to watch and wait for about a minute and then it it turned from the huge bright circle of lights to just 3 green lights in a triangle shape. it started to get further from the fireworks fast in a zig zag motion. it couldn't have been a plane going zig zag so fast in random directions and hovering and staying still, and it was definitely not a star nor a shooting star. and then once the grand finale ended it just disappeared. fireworks began at 9:45. the orb circle ufo appeared around 9:58 the "sketch" i'm going to include will be a google image i can find that looks like what i saw to describe it better and give you a visual of some source.