A specialization of both PurposefulAction and CompositePhysicalAndMentalEvent. Each instance of SocialOccurrence is an action in which two or more agents take part. In many cases, SocialOccurrences involve communication among the participating agents. Some instances of SocialOccurrence have very elaborate role structures (e.g. a typical lawsuit), while others have fairly simple role structures (e.g. greeting a colleague at work).