Last week, we took Super Robo Rally to a school carnival near Bryan's house.
We set-up SRR to play "King of the Hill", where players had three turns (about 1/2 hour) to program the robots to race to the flags (red squares) and stay there as long as possible.
The people running the carnival were great! They set up a system where up to six kids could get a "Quick Pass" ticket for each half-hour game, and two others (waiting in line) would also join.
Bryan would spend a couple minutes explaining the rules to the players and their assistants (parents).
We weren't really sure how this would play out for elementary age kids, but in retrospect, I'm not sure what we were thinking... Kids (mostly boys)... programming robots... made of LEGO... to race... and shoot each other.
Overall, this format worked VERY well in this context. The kids had enough time to understand the game, they were able to play several turns, and everyone seemed to think it was super cool.