Contests I went to as a kid years ago - Minneapolis, Mankato, Des Moines, Fargo - all included balloon bust. A fun easy event for new fliers that basically involved level flying. Speed for 7 laps on 60 foot lines times balloons popped out of 6 attempts. Signal an attempt on the previous lap. Balloons were on balsa sticks, rotated out to the edge of the circle one at a time on a long 2x4.
An introductory event, but it helped young people and newbies feel like we were part of the contest, and of course we hung around and got exposed to stunt, racing, combat & everything else. Some got hooked and grew into the hobby. Good memories.