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maximumPhysicalAttendeeCapacity

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
The maximum physical attendee capacity of an Event whose eventAttendanceMode is OfflineEventAttendanceMode (or the offline aspects, in the case of a MixedEventAttendanceMode).
Values expected to be one of these types
Integer
Used on these types
Event

Source

https://github.com/schemaorg/schemaorg/issues/1842