I would even go so far as to say it's quite common for people to celebrate mothers day in may.
Especially with China and India joining in
(
gronkpan https://twitter.com/VomitingLarry,
Sun 22 Mar 2009, 22:21,
archived)
we already have may day in may
and also may bugs
mothers day would be overkill
(
Rebel biscuit stercore sumus et nos esse novimus,
Sun 22 Mar 2009, 22:31,
archived)