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I don't think there is any direct reference in that wording 

Would assume it's just standard boilerplate text, that they've applied because the show went in their system from one date to another.   It's also possible that tickets had already been issued with the now incorrect date on them, for the promoter to use as comps.

OK, so AC/DC don't actually have a song called All Guns Blazing, but I thought Judas Priest as headliners may be a step too far.

fair enough. I just thought it seemed odd for a show that hadn't been on sale for the date it had changed from. surely on that basis there would be no tickets already out there 

Should be nice and rested for the slot by 4am then.