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Hosts can optionally cap total attendance (RSVPs + plus-ones) when creating an event. Capped events require guests to log in via the existing email code flow; RSVPs are tied to accounts and deduped per user. The event page shows spots left and replaces the form with a full notice when the cap is reached; the server rejects over-cap RSVPs and edits with 409 as a race backstop. Also threads a safeNext-validated ?next= param through the login and name-setup flow so guests land back on the event after signing in. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>