At the collegiate level (in the Midwest where many early slalom skiers only run 0-2 passes) the regional tourbamebt is held at a 1 lake site and has about 80 men and 80 women slalom trick and jump over the course of a long weekend (Friday, Saturday, first half of Sunday) if the field was limited at the state, regional, and national level to about 60-80 skiers total on a two lake site I would think it would be possible to run a 2-3 round 3 event tournament (so a single skier can ski all 3 events all rounds) over the course of a 3-4 day event. So all of Thursday, Friday, Saturday, and the first half of Sunday leaving Sunday afternoon/evening for travel. This would of course require a limiting of the playing field in many states particularly in the most competitive age groups.
Obviously skiers in non collegiate events tend to take more time on the water in slalom but 3 jumps is 3 jumps for the most part and trick is trick.
I'm sure I'm missing some logistical piece here that makes this impractical.