One Buddhist feast day is the feast of Vesak Trisuci. The word "Vesak" is derived from the Pali "Vesakha" or in Sanskrit called "Vaisakha". The name "Vesakha" was taken from a month in the Buddhist calendar which usually falls in the month of May the Gregorian calendar.
related:
Waicak history
goal feast Waicak
feast Waicak
Ghost Festival feast
Seclusion day
Nyepi holiday greetings in English
Applications It's Very, Very FREE! And You Can Be Used Without Internet Connection
Hopefully this app can be useful for you all :)