You can have multiple tournaments as part of your series. Even more then one on the same weekend. You can give points and bonus points depending on bracket size.

On an OPEN TOURNAMENT with a split format session you can run
6 8 and 12 year olds in the morning.
One Full Mat
Six quarter mats
Seven half mats
Start turning quarter mats into halfs and moving matches as soon as you can.

Afternoon session you run three full mats and six half mats.

Everyone headed home by 5 or 6pm
A lot of clubs don't run that many mats cause they can't handle the table workers and other staff.
But by combining small tournament it a win win win for EVERYONE.