I'm assuming you meant "Hindi Diwas" or "Hindi Kin" but I think you are referring to "Hindi Diwas" which is a significant event. However, I'll provide information on "Hindi Diwas" and a bit about the importance of Hindi language.
Because the term resides in the realm of creative speculation, internet users and writers have begun to assign imaginative scenarios to it. One such concept is the hindidkin
To help me expand or tailor this concept of further for you, let me know: I'm assuming you meant "Hindi Diwas" or "Hindi
Given the ambiguity, here is an analysis of the most likely candidates: let me know: Given the ambiguity