Spring in Dubai

I was wandering along a path I don't normally take, a path the authorities intend to be viewed by the tourists, so it was furlongs of spring florescence. I recalled Houseman:

'Loveliest of trees, the cherry now
Is hung with bloom upon the bough,
And stands about the woodland ride
Wearing white for Eastertide.'

Or, for Dubai,

Datepalms that shade the passing dhow
Are hung with wispy flowers now.
But how it is I can't decide
They're all decked out for Eastertide.

For Easter here is not observed,
Well, maybe chocolate eggs are served.
So how do all the datepalms know
That now's the time for Easter show?