3 sphere's , 3 colors , doing figure eight in sky. Stoped car race. everyone saw, no one remembers ? Has anyone else seen this ?

When I was younger, I was at a stock car race in Pennsylvania.  During the race I noticed 3 lights in the sky all round, and different colors of red, green, and yellow.  I yelled to my dad to look at the approaching lights far off in the distance when they started to intertwine with each other almost like a figure eight.  My dad and his brother were there and they both started pointing in the sky.  Soon everyone in the stadium was pointing in the sky.  Soon I noticed there was no more noise from the engines of the cars.  When I looked down at the cars, the drivers were out of their cars and pointing at the lights also.  Can’t remember the lights leaving, or my dad and brother talking about it and do not remember the race starting again.  Remember walking out to the car in the field after the race.  I do remember my mother being upset with my dad for being so late getting home.  Brought it up to my dad many times throughout his life, but he would just say he doesn’t remember.  
My dad’s brother never remembered the incident either. 
I am 58 years old now and remember it like it happened yesterday. I was not afraid at the time when it happened, was just wanting to know what those things were in the sky.
Witness indicates that the date of the sighting is approximate.  PD