The brochure from 2013:
http://www.twocanfly.com/wp-content/uploads/2013/07/Red-Rocks-Fly-In.pdf

There will be low-pressure competitions, informative clinics, and
fun flying activities, as well as non-flying entertainment for members of the
family who want to help drive on some days, but need some "on the ground
stimulation" sometimes.

Expect 200 - 250 pilots.