year    month   subchannel      count(*)
2013      10    creativemornings    1
2014       3    creativemornings    2
2013      11    founderinstitute    1

year    month   subchannel      count(*)
2013      10    creativemornings    1
2013      11    creativemornings    0
2013      12    creativemornings    0
2014       1    creativemornings    0
2014       2    creativemornings    0
2014       3    creativemornings    2
2013      10    founderinstitute    0
2013      11    founderinstitute    1
2013      12    founderinstitute    0
2014       1    founderinstitute    0
2014       2    founderinstitute    0
2014       3    founderinstitute    0

SELECT
        year(l.created) as year,
        month(l.created) as month,
        l.subchannel,
        count(*)

    FROM db.l_events l

    right JOIN db.calendar c
        ON (date(l.created) = c.datefield)

    WHERE
         l.created between '2013-10-01' and '2014-03-31'

    group by
        l.subchannel,
        year(l.created),
        month(l.created)
        ;

SELECT
    year(c.datefield) as year,
    month(c.datefield) as month,
    s.subchannel,
    count(l.created)
FROM db.calendar c
    CROSS JOIN (select distinct subchannel from l_events) s
    LEFT JOIN db.l_events l
        ON (date(l.created) = c.datefield)
        AND l.subchannel = s.subchannel
Where c.datefield between '2013-10-01' and '2014-03-31'
group by
    s.subchannel,
    year(c.created),
    month(.created)
order by
    s.subchannel,
    year(c.created),
    month(.created)
    ;