core + attic (Attic Area): these terms have been either deprecated from the core or extentions, or removed from pending as not accepted into the full vocabulary.

remainingAttendeeCapacity

Canonical URL: http://schema.org/remainingAttendeeCapacity

Thing > Property > remainingAttendeeCapacity

The number of attendee places for an event that remain unallocated.
Values expected to be one of these types
Integer
Used on these types
Event

Schema Version 3.3