--- schema_version: "1" id: 41f4354c820415fdbf5a0839b5e7ecf70eb18a1034c54ca679dcd7ff94f9fd22 title: EventWhoRelation collection: legacydeveloper version: current locale: en-us portal_url: https://docs.salesforce.com/legacydeveloper/current/en-us/object_reference/sforce_api_objects_eventwhorelation.md canonical_url: https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/sforce_api_objects_eventwhorelation.htm source_site: developer.salesforce.com content_type: documentation content_hash: a52feb83bf01aa8d885b1a90a5876746fb084b487b7d159866c1d5d3afde755a description: Represents the relationship between an event and a lead or contacts. This derived object is a filtered version of the EventRelation object; that is, IsParent is true and IsWhat is false. It doesn’t represent relationships to invitees or to accounts, opportunities, or other objects. This object is available in API versions 29.0 and later. --- # EventWhoRelation Represents the relationship between an event and a lead or contacts. This derived object is a filtered version of the [EventRelation](https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/sforce_api_objects_eventattendee.htm "Represents a person (a user, lead, or contact) or a resource (such as a conference room) invited to an event. This object lets you add or remove invitees from an event and use the API to manage invitees’ responses to invitations. If Shared Activities is enabled, EventRelation can also represent other objects that are related to an event. EventRelation does not support triggers, workflow, or data validation rules.") object; that is, IsParent is true and IsWhat is false. It doesn’t represent relationships to invitees or to accounts, opportunities, or other objects. This object is available in API versions 29.0 and later. EventWhoRelation allows a variable number of relationships: one lead or up to 50 contacts. Available only if you’ve enabled Shared Activities for your organization. ![Note](https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/images/icon_note.png) #### Note EventWhoRelation objects aren’t created for child events. ## Supported Calls describeSObjects(), query(), retrieve() ## Fields | Field Name | Details | | --- | --- | | EventId | Type reference Properties Filter, Group, Nillable, Sort Description Indicates the ID of the event. | | RelationId | Type reference Properties Filter, Group, Nillable, Sort Description Indicates the ID of the contacts or lead related to the event. | | Type | Type string Properties Filter, Group, Nillable, Sort Description Indicates whether the person related to the event is a contact or lead. | ## Usage Apex example that queries relations to a contact or lead List whoRelations = \[SELECT Id, Relation.Name FROM EventWhoRelation WHERE EventId = '00UD0000005zijD'\]; #### See Also - [Event](https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/sforce_api_objects_event.htm "Represents an event in the calendar. In the user interface, event and task records are collectively referred to as activities.") - [EventRelation](https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/sforce_api_objects_eventattendee.htm "Represents a person (a user, lead, or contact) or a resource (such as a conference room) invited to an event. This object lets you add or remove invitees from an event and use the API to manage invitees’ responses to invitations. If Shared Activities is enabled, EventRelation can also represent other objects that are related to an event. EventRelation does not support triggers, workflow, or data validation rules.")