It’s not whether or not you can play the gig. You probably can.
It’s about do they trust you to play the gig.
And can they trust you to still play the gig when things are not optimal? In-ear problems, set list change, there wasn’t much rehearsal time, broken strings or sticks or keys, a special request, you don’t feel well, dinner didn’t show up, there was an argument off stage, wardrobe puts you in a silly jacket.
(Almost) Anyone can learn the gig. Very few can earn the trust.
