I have a ticket to see a comedian, never been to anything like this and I'm confused about when to arrive. The email says doors open at 7 for 8pm show. I know there are support acts to see and I want to be there at the start. Should I be there ready to go in at 7 or can I turn up at 7.50? There are 2 of us and we would like to sit together but it's not crucial. This sounds really naive even as I write it but I don't want to turn up at 7.45 and the support acts have already started!