Guitar Player can't rehearse tonight because he has to help his wife get ready for Halloween in two days.

Different people have different priorities. If they don't mesh well, friction, heat and entropy result.

If this kind of thing from your guitar player is an infrequent, once in a long while kind of thing I would zip up and let it pass. If it happens too often to be comfortable for you, then your priorities and his aren't meshing and it's highly unlikely that they can be made to mesh. Perhaps time to look for another band situation (or another guitar player)?
 
Halloween is a big deal for some people. If my wife says she needs my help with something that's important to her, that's my priority. I think it only becomes an issue if there's weekly drama of some sort that's interfering with the band commitment. In which case, the band needs to make decisions about its own priorities and proceed accordingly.
 
Didn't we have this thread last year? It rises from the crypt...
Well, it is Halloween!:nailbiting:

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Happy wife, happy life. Happy band, cool fun gigs on some weekends. You decide.
That is said a lot, and I would agree in this case, but to me it has to work both ways, I use "happy spouse, happy house," which means both must accommodate the other when requested.