Twenty hockey games with four seats each for an event

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Use one Complex Event with a separately dated/named Activity for each game. Give each game a free ticket type with capacity four and set its activity capacity consistently. Configure parent registration dates and guest limits, describe the choice rules clearly, and test a registration plus sold-out behavior. This manages inventory per game; it does not mean an automatic one-game-only restriction across all twenty activities, so review that requirement separately if needed.