CELEBRATE! :D
But not in Calcutta. If you think you'll celebrate Astronomy day in Calcutta by watching the very rare occultation of Mars by the moon, you are very mistaken.
In Calcutta, the weather and the people are not suited to astronomy. You see... the skies of Caluctta hate astronomy. So much so that they'll entice the few [very few] amateur astronomers here by having nimbostratus clouds cover up the sky, but being stratus they allow a fair amount of blurred light from the moon to dall upon us.
"LOOK! IT'S THE MOON!! BUT YOU WON'T GET IT HAHAHAHAHAHAAHAHAHA. SUCKS TO BE YOU!!!!"
And my telescope lies... discarded. I hate the skies of Calcutta.