How about: each user creates an account with their legal ID. Obviously unique so they can’t create multiple using the same ID. Before the sale, everyone signs up. Once the sale is started, tickets are distributed using a lottery system for the users who signed up (so refreshing like mad doesn’t give any advantage). Can only buy up to 2 tickets per person (their own and an anonymous companion). ID must be shown and would be verified at entrance.
If you wanna be even more strict: You could allow up to X companions, but they must not have signed up with their own account (so they don’t have an advantage for doing so). And they must provide their ID before the event as well and arrive as a single party.
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