It's probably too late to mention, but if you're still here cappachino ; you can try :

1- using a capo, which lowers the action and makes it easier to play the fingerboard.

2- - switch to nylon strings , they're softer and easier on the fingers

3- I have never tried this but I' m wondering if surgical or kitchen cleaning gloves would work? Wouldn't hinder your flexibility and the kitchen gloves are cheap and readily available at any supermarket, drugstore or dollar store.

In the future, you can make your fingers calloused by playing your guitar every day , even for a couple of weeks just before the gig . Btw, if it were your other
hand ( strumming hand), finger picks will totally help and protect your fingertips when playing and picking the strings.

Good luck, let us know how it went.