Eid ul-Fitr
Culture/religion: Islamic
Date: May 13
Eid-ul-Fitr marks the end of Ramadan, the holiest month in the Islamic calendar, and traditionally lasts for three days. The celebration is a time of charitable giving, focused and careful prayer and a season of month-long fasting during daylight hours.
Greetings: Eid Mubarak (Blessed Eid); Eid sa’id (Happy Eid)
Sources:
Eid-ul-Fitr and Eid-ul-Adha – What is the difference?, Muslim Aid
Ascension Day
Culture/religion: Christianity
Date: May 13
Ascension Day is a Christian holiday commemorating the day Jesus ascended to heaven.
Ascension Day falls on the fortieth day from Easter, always on a Thursday.
Alternate names: Feast of the Ascension
Sources:
What is Ascension Day? The Feast of Ascension, Christianity.com