You have the Ouray and Aspen Jeep Jamboree runs happening then. Both have runs rating 3-9 in difficulty. Just an option if no ones has anything happening for you.
There are Jeep runs every weekend, everywhere in the state. For the front range and if you are on FB you can look up Crawlodoro and find several hundred people from Colorado Springs to Denver on there and we are always posting runs as well as last minute trails.