close range sighting of lit up disk at drive in theater

time and date approximate..i was at a drive in movie near boulder, longmont area. i was visiting from out of state so i,m not too familiar with this area not long after sunset my girlfriend said what's that? at the same time i noticed a lighted craft approaching from the south west. it at first appeared to be a helicopter flying low and makeing slow, gradual turns back and forth as it got closer i could see that the lighting and motions were definitely not standard for a helicopter (or any other aircraft) the object seemed to be attracted by the movie playing on the screen and approached and hovered over the cars parked at the theater. at this time it was at a distance of only 200 feet and an elevation of 200 feet. the shape was that of a classic domed saucer..the lights were predominatly red,orange and yellows of average intensity (like car headlights or street lights) and flashing at a slow rate as the object continued to hover and descend slowly the intensity of the lights dramatically increased as did the rate of flashing. a rectangular structure slowly extended from the bottom of the disk with more lights and more colors..greens,blues,purples. the intensity of the colors and lights became almost painfull to look at. the other people at the drive in reacted by honking their horns and flashing their headlights! at this point about 1 1/2 minutes from the initial sighting, the object was only about