The wind thing sounds justifiable to me. It happens. Normally Bad etiquette for sure if there's no good reason. But really, if you try to do anything about it you will just hurt yourself. I've had a few bad ones: - NYE gig booked months in advance, 3 weeks prior the club decides to go with another band (internal club dispute). We're left without a NYE gig. I haven't played there since. -Showed up to a gig and it's double booked. Both times this happened were were there first and mostly setup. But felt bad for the other band. -I used to run a jam, they cancelled the jam after 2 years as we were setting up. One guy drives 1.5 hours for it.