if it were to be say a 2 day event.. over a weekend or something. You could look at doing more then just competition. You could setup different seminars, training sessions etc..
When I use to do Karate, we had a summer fest which was over a week I think and they held all sorts of stuff. Different defense course, competitions, classes taught by high ranking instructors. etc.
It was very popular and very lucrative. I think something like that for 10pjj would be amazing. I would sign up.