FConcertSessionActivity ( [FConcertSyncActivity](API\Plugins\ConcertSyncCore\FConcertSyncActivity) && InActivity, [FStructOnScope](API\Runtime\CoreUObject\UObject\FStructOnScope) && InActivitySummary, [TUniquePtr](API\Runtime\Core\Templates\TUniquePtr)< [FConcertSessionSerializedPayload](API\Plugins\Concert\FConcertSessionSerializedPayload) > OptionalEventPayload )