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For the Pekora Minecraft thing you need to apply, they then randomly select long term members from among that pool.
If you get past that stage you have a Discord interview with staff and if you nail that you have to give them your personal information.
She talked a bit about how important security is for this event and how there's a ton of people in the background to make sure they don't let anyone trying to fuck with it into the server.
If the EN project does infact have a public side to it too I'd imagine getting into it will be pretty similar.