Haven't been here for a while & time is, as Booker T once said, tight so I only glossed the previous responses.
Here are my relevant thoughts:
1 / Always honor commitments in business.
To quote further from a pop music philosopher (Allan Toussaint) "you might meet 'em on the way back down".
2 / There is often, however, a way to arrange compromises or rescheduling, even near the last minute.
Never fail to try that.
3 /This may be the most important:
Bands seldom work well as democracies.In the same way that some will be more talented as players or composers than others, some will be better at handling aspects such as stagecraft, schedule details, legal & biz concepts, etc.
Not all bands need follow the same template but there should be prior arrangements as to who is best at what.
If need be those things should be set in writing.
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BTW, glad yer doing well, SG !