The Event Capacity will limit the number of customers that can register for a specific event.

Once the capacity is reached, a customer will no longer be able to register for that particular even through the Member App. Registration would remain open for other events in the series. On the Admin side when a staff member is registering a customer, this capacity can be overridden and a customer can be added to the event.
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This setting can be established either on the Edit Camp page for the event.
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Or it can also be saved for all events when creating the series from the Camp scheduler.
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View of Program Registration selector:

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