Some really good tips given already
My advice is to listen to the song and write down the basic chord root notes for the Intro, verse chorus etc and save this in a notebook or folder
You can refer to this at home at practice time in case you need a gentle reminder
At home practice over the songs playing and make sure you know the basics
Next and this is more important is to remember to look like you are enjoying it when you gig and that you are there to entertain and perform not just play !
Learn to be a band as one, sound and image etc
Finally always rehearse like it’s a gig at a near gig volume if possible to learn the dynamics of volume etc
Have fun