Um, I thought it was the pagan sabbat festival of
Beltane.
Which can be flowers and butterflies...
...or
bees!
Or even the Padstowe 'Obby 'Oss festival -
http://en.wikipedia.org/wiki/'Obby_'Oss_festival
Even *I*, tone deaf and utterly lacking in any sense of rhythm, used to sing the Padstowe song every mayday while wandering the lanes and fields and checking the may flowers.
And don't forget the maypole!
Anyone currently studying the pattern and flow chapter of the Designers' Manual might find some food for thought in this...