eventAttendanceMode

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > eventAttendanceMode

The eventAttendanceMode of an event indicates whether it occurs online, offline, or a mix.
Values expected to be one of these types
EventAttendanceModeEnumeration
Used on these types
Event

Source

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