I hate going to see my friends’ bands

There’s little worse than being emotionally blackmailed into going to see your friends play a gig. It’s bad enough watching a dreadful, sleep-inducing band. But when your friends are the members of this soporific group, unlike at any other gig, you can’t leave early for fear of offending anyone. So, for the entire night you will then have to stand with a constant forced gleeful grin on your face to give the impression you are having fun. If everyone else is dancing you may even have to sway from side to side so as not to look too conspicuous. I pride myself on my honesty but is there anything you can do when the band come at the end to ask you what you thought apart from smile falsely, nod a lot and tell them it was “really good”?