Consulta para obtener la unión más reciente en otra tabla con fecha

SELECT  *
FROM    #EventOccurrence eo
OUTER APPLY
        (
        SELECT  TOP 1 Grade
        FROM    #GradeChange gc
        WHERE   gc.id = eo.id
                AND gc.EffectiveDate <= eo.EventDate
        ORDER BY
                gc.EffectiveDate DESC
        ) gc