The party's already begun on Lookout.
From
http://jeffco.us/sheriff/sheriff_T62_R309.htm
"NOTICE: Due to early heavy traffic, Lariat Loop Road will be closing at 5:00 p.m., Saturday, August 27, rather than 5:00 a.m., Sunday, August 28. Only foot traffic, bicyclists, and local residents in vehicles with identification will be allowed in."
I'll be pedaling that direction in about 11hrs.