I think the warm-up clinic's are a good idea. Gives the parents an opportunity to see what kind of people are involved with the clubs. And the kids get a chance to work out the kinks.
It would be good if they could do more than two groupings, one of the warm-ups had the boys split in 2-6 & 7-10 (grades).
Obviously more groupings require a bigger staff. Fully aware of time limitations but there is a big difference in 2nd graders skill set and a 6th graders.
On the whole, I think it's a great idea.