I played the judge a few years ago.  Actually, I only played it one weekend; I was sort of the "understudy" to the real judge they got to play the judge.

Is this something you could do?  Get a local jurist or lawyer to play the judge?  It's a two-line nonsinging walk-on.  Good publicity possibilities.

Make REAL sure you have a dedicated, first-class tech crew, especially sound people who really know how to run a miked show.  Our tech rehearsal ran . . . well, I wasn't actually required to stay for all of it - I know it ran past 2 AM (it was a 1 PM start, we ran it twice, with a pizza break in the middle.)  (Note also that the good judge was not required to show up for that debacle at all!).

Also make sure you have strong ROCK musicians and ROCK singers.  Some of the music is "broadwayized" a bit, but people are going to expect to hear that famous riff at the beginning of "Pinball Wizard", and they'd better get it.  The Who's sound is almost defined by Moon's drumming and Entwhistle's bass, so get those guys lined up first.  And a "real" singer who doesn't know how to sing rock style will have no voice long before opening night.

And do the mirror smash better than we did.  ("Do you hear or fear or/Will I smash the mirror?"  Tommy walks up to mirror, holds up fist.  Interminably long blackout, with obviously canned mirror smash noise.  Lights up, eventually.  Mirror gone, with token pieces on the floor.)

It is a spec-freakin'-tacular show when done right.  Have fun!

What, do they have a moral objection to pinball?