Likely they wouldn't, but if during their line chrck, they found other more dangerous omissions and failures by the promotor to setup the stage and equipment correctly, they definitely could cancel.

These guys were working with thousands of amps of electricity, hundred of pounds of equipment, pyrotechnics,etc. Could easily severely harm or kill someone if it wasn't setup properly. No obligation to do a show of the other side of the contract isn't being fulfilled

Legally they can as it is a violation. They probably never did just based on that, but it would be in the list of reasons.

That way you don’t have to point your fingers around to cancel that show.