I saw these lights three times now in two different locations

It was after an event during clean up that we noticed these vertical lights above the tent. They were only visible for a few moments before fading away. The second time was driving home late at night, I was in Roxbury when the lights appeared above. The lights moved in a strange sequence and the shape looked as if it curved near the end like it could be octagon shaped but all that was visible were the lights. I was not going to report anything until I saw them recently. Again late at night in the Washington/Roxbury area. It is always cloudy out when they appear.