It's doubtful. It wasn't called "Jefferson" back then, it was all just Dale Street. IMO, the party must have been on Saturday night, because DR went out running from his farm straight north to the Del-Win sometime in the evening before the abduction. He certainly would have heard 25-30 kids partying in the woods right there, and he has never mentioned anything about that. He came back home along the other side of the woods on 16th/91st, so he would have passed them twice.
Also, Kevin says he knew where the party spot was, and he would have known Dale Street circled back to Tom Thumb. I still find it hard to believe he thought DR's driveway was a road anyway, since he knew the party spot area(s). It would only look like a road to someone not from St. Joe. It has a mailbox and a fire number.
Also, supposedly on Saturday night there was a whole troop of boy scouts camping out in one of these woods near the abduction site. On Sunday night the polka party at the Del-Win went until 10 pm. So there would have been lots of cars coming and going from that right around the abduction time also. Kind of strange all these people weren't bumping into each other. I'll wait to see if any other Apollo students were at this alleged party. (JMO)