well, I can't say for sure BUT I do know that when I inquired about bringing my dog to watch an agility trial here in Asheville, NC I was told that only dogs that were registered to compete could attend the trial; and only if their shot record was up-to-date.
I would assume that different clubs have different rules.
Have you been doing any agility skills with your trainer and your pup?
There may be some beginner participation classes or exhibitions that would allow you to "try your dog out" on the equipment. That is, you're not competing but you get a chance to run your dog through the course to get a feel for the event. I know that my sister took her Jack Russell Terrier to an event one time and they allowed novices to run the course. With no training at all her Jack Russell took the best time on an underground seek-and-find course (don't know the true name of this competition but I've seen it on TV once, the terriers follow a scent track through underground maze tunnel and it is a timed event).
Sounds like you will have a fun time whether you get to dip your toes in or whether you and your pup will be there to observe only! Don't forget the traveling water bowl as well as treats!