The joys of pure collaboration and the theater arts are not lost to those who do not wish to perform onstage. As I said, theater productions require people with a wide variety of skills. Theaters need electricians and lighting designers, costume designers and seamstresses, make-up specialists, people to build props, backstage support... There is lots of technical work to be done!
But how do you incorporate technicians in a 3rd grade skit? It may take some creativity, but it is easily doable:
* Will there be costume changes? Maybe your cast needs a dresser, not only to help but to keep track of costumes.
* Do you need an assistant director or stage manager? I'll bet you do.
* Or maybe your skit would be improved with a painted backdrop. Your technicians could work on that while your actors rehearse.
I once had a gig at a middle school as a Guest Artist in Residence. I taught five different classes to 7th and 8th grade students. Some of those classes were mandatory for the kids to take. I had one especially shy group that did not relish putting on a performance. They did a wonderful job of crafting props, and their work was necessary to the success of the entire endeavor.