SELECT TOP 1 event_IntID
  FROM EventsTb EvT
  JOIN ActionsTb  AcT ON AcT.action_EventFK = EvT.event_IntID
    WHERE AcT.action_IntID IN
      (
      SELECT TOP 1 action_IntID
        FROM ActionsTb
        WHERE AcT.action_EventFKD = EvT.event_IntID
      )