A zero shadow day is an astronomical event. On this day the Sun does not cast a shadow of an object at noon when it will be exactly at 'Your Zenith'. Zenith is an imaginary point directly overhead from a particular point on the ground. It lies on an imaginary celestial sphere. It is also expressed as an exact opposite directional point opposite to the apparent gravitational force at that location. In simple words, it is a "highest" point overhead on the celestial sphere.
When the Sun comes at this point you experience Zero Shadow Day at your location. Zero shadow day happens twice in a year in tropical regions. Between the Tropic of Cancer (+23.5) and Tropic of Capricorn (-23.5) are the areas where you may observe it. The dates will be different for different regions on the Earth.
Check the list given here to know dates for the ZSD event at your place. We have tried to cover many regions. If your place is not listed, see any nearby district or city that is listed here. Else write us for details, we will facilitate you with for any further information.
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