Sorry this happens Brian...Murphy sucks.
FWIW, not all is lost. If you record the shows using what you have, since you'll be recording in essentially mono, just record that way then in post separate the two tracks by .001ms or .002ms, then add a tiny bit of reverb. You'll be surprised how much this will sound exactly like what you'd have gotten with two channels. Course, it's not stereo but oftentimes the PA mix isn't mixed in stereo anyway.