Suddenly a big, bright red circle appeared to the sky!

I was eight years old then (22 now), but i can still remember it like yesterday. Me, my brother and my mother were at the consert of Janis Parios or what ever it was at KOS. The place was on the beach boulevard, some big parking lot. The consert started around 21:00 so it was dark then. It was getting a little chilly so my brother went to sit on my mothers lap (arms). I was sitting next to them and i was getting bored so i started to look at the stars. There was no clouds, beautifull night. Then suddenly a big (little smaller than a full moon), bright red circle appeared to the sky! It came from nowhere just like that! Just like someone would've turned on the lamp! I was stearing it and i said: mom, look! Guess she didn't hear it at first. Few seconds went and it rapidly started moving at very high speed! It flew maybe two times the diameter of full moon and disappeared just like that! Just like the way it appeared, like this someone would've turned the lamp off! It left a red trail behind! Diameter of this trail was the diameter of this circle. All this happened in maybe 6seconds max. My mother and my brother soo this read trail. Then it slowly disappeared too. So anyone who looked at the sky then would've seen it. This has been bothering me ever since. Hope to get an answer some day...
Date is approximate.  Location of sighting is not indicated by witness.  PD