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.

organizer

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

Thing > Property > organizer

An organizer of an Event.

Usage: Between 100 and 1000 domains
Values expected to be one of these types
Organization
Person
Used on these types
Event

Schema Version 3.3