I believe that you have to be Category 5 or 4 for time trials.
Category 5 for road/track is just send in your $ for a license. Category 4 is passing the Beginner class.
So, you should be fine.
When in doubt, email the promoter. You can on the official flyer. A fully informed flyer is required by USA Cycling to get a permit.
Here is the contact info:
http://www.usacycling.org/events/?st...=&rrfilter=all