From W3C Wiki

This is an archived WebSchemas proposal workPerformed for schema.org. See Proposals listing for more. Note: active schema.org development is now based at github

This is a proposal for a new property on schema.org's Event class.

Property name: workPerformed

This property is expected to be used on Event, with values that are a CreativeWork.

It indicates that the CreativeWork was performed at the Event.

e.g. a http://schema.org/TheaterEvent might be performing Macbeth.