I'm pretty sure he was shooting a G17. I was pretty impressed.
I think all you have to do is contact GSSF for the match set up. I know they had the usual phone calls back and forth but I don't know the particulars.
Does the range there have a retail store too? I know these matches bring in a bunch of people so that could be and incentive to have a match.
Don't know if you went last year but you might want to also check out the Greeley outdoor match scheduled for August 17-18 2013. The shooting is a bit different and I guess it would be a bit more of a drive but worth going to. It's at the Weld County Fish and Wildlife range. It's a really nice set up.