Allow for skillups in Ballista (Since I believe they're deactivated for the event).

Allow for new Ballista only weapon skills or spells with focus on interesting and new enfeebling effects rather than incredible damage output. Obtainable by chevron acquisition, petra scoring, or some other measure.

Raise the EXP reward for a match (500 EXP is a bit low).

Create purchasable equipment (weapons/armor) with "ballista-only" stats obtainable by spending Ballista Points.

Possibly increase the availability of Ballista areas. If a sanctioned match is not occuring, you have 2 zones whose participation can be 'rented and controlled' creating a bottleneck. Lowering the amount of exposure to potential new participants.

Change the discharge rules, it's no fun when people leave a side after having signed up and do not get a discharge. The teams will be far too unbalanced to be enjoyable. A time limit perhaps, because there's always cause to change jobs if necessary during the match.

I can't think of anything else. It's honest to good fun in those matches. Especially if you bring friends. Maybe that silly joke piece of gear like a clown nose just might be enough to get your friend in the linkshell to come try it out with you.