I was at a fourth of July event in Downingtown, PA around 8 pm. I was with my boyfriend at the time. I look over to my left and there are 3 balls of light flying in a straight line not too far behind eachother . . . And then they went behind the trees so I couldn't track them too long. Then about 45 seconds later 2 more crafts that traveled the same path as the previous 3, and they also disappeared behind some trees. They looked like flashing circular lights. And while they were in my line of site, they got dimmer the longer they flew. I showed my boyfriend but he only got to see the last two previously mentioned.