Why not incorporate slotted times for the different age groups? Wrestling is one of the few if not only sport where a kid and his/her family has to stay anywhere from 8-12 hours at a tournament for 3-5 matches. Most other sports are done within 2-3 hours. Football, soccer, and baseball events are slotted by age groups. You don't see 8 year olds playing at the same time as 15 year olds. This could and should be done for beginning to intermediate level tournaments. I understand that this might not be best format for state level events, but if the kids can compete at that level, they're already hooked.
Any other thoughts or suggestions?