St Patrick’s Day yesterday and according to the ancient Persian calendar, the Persian New Year starts on 20th March.  New Year celebrations take 13 days .This event is celebrated in Iran, Afghanistan, Tajikistan and some other countries around the Persian Gulf.
Do these sort of dates need to be in your planning diary for various staff or customers from other countries or with a different cultural background?  The resource below is invaluable if you do.
http://www.shapworkingparty.org.uk/index.html