If you guys enjoy Rio Bravo MX Park,they are having the (I think 5'th)Annual Oldschool Reunion on Sept 18.
It will be catered by Carrabbas Italian Rest.
Will mostly be just a fun event,but there is a Tag Team race.
Marty Smith,Marty Tripes, and Steve Wise have confirmed to be there,and possibly a few other Factory Pro's from the 70's

http://www.oldschoolmxers.com/

How bout Kenny Nigrelle or Eddie Jones, they gonna be there, lol

Not the 18th this event was today the 9th.
I'd attach the flyer but its already over and anyway your link had the correct date also.

This post was a year old from 2011, when it was on the 18'th