I've got a large event coming up that I cannot get out of. It's going to also be attended by a friend I fell out with - we haven't spoken for a while- the falling out was really difficult but now in hindsight I can't really pin down what happened. I have reached out twice (once via a mutual friend and once with an email) and I apologised for my part in it (There were extenuating circumstances) but both went unanswered. It's clear that they do not want to reconnect with me and I think I have made my peace with that, but I am dreading the event. We still have mutual friends. How do I handle it?