Hello Rajesh,
With regard to your concern, we suggest that you add the holidays to your calendar in Outlook for Windows if you are using an Outlook Office application. Kindly select the country that you prefer. Check on this link for more information on how to set up adding it to your calendar.
But you can provide a suggestion on this link if you are referring to Outlook.com through the web.
Your reply is most important for us to ensure we assist you accordingly.
Regards.