There should be some way to identify the number of places that are available for an event. Both in total, as sometimes it matters whether an event in a small gathering of a few people or a coming together of thousands, and also the number of places that remain available, as sometimes it is useful to know that an event is about to sell-out.
This came up in the context of educational courses as events (see email discussion for the schema-course-extend group, also mentioned in issue #1092); but seems broader than educational courses.
I suggest two properties:
eventCapacity: integer; the total number of individuals that may attend the event.
placesRemaining: integer; the number of places for the event that remain unallocated.
(Maybe the inventoryLevel property of Offer can be used for places remaining, but it would require a change to the definition)
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I was originally going to suggest we add this to Place instead, but there would be no way to express the capacity for virtual events. Should we change the name to maximumCapacity and add it to both http://schema.org/Event and http://schema.org/Place?
In which case, I would suggest renaming placesRemaining to remainingCapacity to make it clearer the two properties are related.