So I'm leaving my job for a few reasons and one of them is my boss and their attitude towards me. Myself and another colleague are leaving around the same time and thought it would be a good idea to join up the leaving do, which will be a shared lunch where everyone brings in a dish. My boss discussed this and then sent out an invite saying it's 'Juliet and Colleagues leaving do' in the title but it's on a day that I don't work. I told my boss to remove my name from the invite and they refused saying they would verbally update people on the day to inform them I'm not coming. I'm very close to putting a grievance in against my boss because their behaviour is appalling at times. WWYD?