Wireless microphone system for Canon Vixia HF-S200?

I will be videotaping an elementary-school play in March. I have two Canon Vixia HF-S200 camcorders at my disposal.

The cameras will be in the back of the small auditorium, about 50 feet from the stage. The play has no amplification, so I don't imagine I will get decent audio back there.

I would like to plant a microphone on the stage and hook it up to the audio input of one of the cameras. Running a cable that far doesn't appeal to me that much.

Is there a wireless microphone system that would work in this situation, and give me good audio quality?

Thanks!