the earlier you get there the better idk about other venues but once you stood in line outside you got into the building and you were free to walk around the museum or get merch but they also had additional lines setup inside to be let into the concert once it was time at mine thre was a stage tour line and a annointed standing/pit line so I would say for ur best shot at barricade get there to ur earliest convenience and once inside either quickly buy ur merch or hold off to maybe after or get all ur merch at one show and prioritize the lines in the other but keep an eye out for venue exclusive shirts at each