Adding US Holidays & Sharing Calendar in Outlook

Adding US Holidays & Sharing Calendar in Outlook

For whatever the reason, I do not see where I can add the US Holidays to my Zoho Calendar.  Am I missing something or is this an issue in Zoho?  Very disappointing....I had originally moved my zoho calendar to Outlook, but moved it back to the Zoho mail online when I needed to share my calendar with a co-worker.  For some reason, once I moved my calendar to Outlook, it would no longer let me share it with a co-worker.