Different Theater, Same Results

So I'm subbing in for the extended run of The Great American Trailer Park Musical, and I really do enjoy performing the show. I just seem to have a complicated relationship with theaters - I go in to play, and the gear goes wrong somehow. Club gigs, private shows, large venues - never seem to have a problem. Put me in a musical, though, and things go wacky. This particular performance has some bass-focused music, too, so there's no hiding behind the synths in case something goes wrong. Fortunately, everything that went wrong went wrong before the start of the first show and I could remedy the situation easily:

1. Bad cable - lifetime warranty doesn't beat the spare cable (or the Stage Ninja cable when I was told the backup cable was too long for the stage
2. Radio station in the amp - really? In a grounded bass amp with no other indication of issues? Managed some gain and EQ tweaks to minimize, and I'm not going through a PA anyway, so it's not noticable
3. Lightbulb on music stand goes out - alright, that's not my fault. Stage lights and a quick replacement carried the day.

I suppose that's why I keep the spares around, but I'm moving on to another musical this weekend, and I wonder what's going to break there . . .