I've been to 2 Manias (X8 and XX) Both were similar before, doesn't necessarily matter when you get there as people kinda trickle in until the announced bell time. As was mentioned, find a place nearby for some beer/drinks and chill before. Getting out may take a while. Mania XX wasn't SO bad as it was an arena, but it took me a while to get out after X8, with nearly 70,000 people leaving all at once and being in the nosebleeds.
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