Rhythm Deaf. I have had many students over the years who were rhythm deaf. Last year and this year I have had one that try as I might I could not get them in the zone. I have tried physically tapping their feet, tapping their shoulder, dancing with them but all to no avail. If it is not there it is not there. Harsh but there it is. He will not find it in the next 3 weeks. Do the gig, film it and use it as evidence. Or cancel it and save the good name of the band. But do not imagine that the gig will work. It will not.