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This post is based on my personal experience of watching the show on 8 December 2021. This may differ from others' experiences and as always, always contact venues direct for the most up to date info.
How long before the show should I arrive? We arrived at Central Station at 5:30pm for a sold out show with a 6:30pm start. We walked to the arena, through the COVID check, through the metal detectors, stood in the merch queue in the foyer, ordered drinks from the bar and were in our seats for 6:20pm. I would say if you want to buy merch/food etc....aiming to be in Newcastle an hour before the show starts is a good idea. There were quite a few latecomers.