Source: Schema.org v30.1 vocabulary. Official subEvent property definition.
What does subEvent mean?
An Event that is part of this event. For example, a conference event includes many presentations, each of which is a subEvent of the conference.
Used on types (domainIncludes)
Expected value types (rangeIncludes)
Schema.org domainIncludes and rangeIncludes are descriptive guidance, not strict validation prohibitions. Check the official reference for updates.
Related reference
Browse all Schema.org types and properties · Google feature support status