On this day, April 21, in 1899, the first Presbyterian missionaries arrived in the Philippines led by Reverend Dr. James B. Rodgers.
The official calendar of the Republic of the Philippines: an almanac of Philippine commemorations enlivened with illustrations and information. –Manila: Presidential Communications Development and Strategic Planning Office, [2014].
On this day in 1934, a photograph of the Loch Ness monster appeared in the Daily Mail which would later prove to be a hoax.
https://www.britannica.com/on-this-day/April-21
On this day in 1972, the astronauts aboard Apollo 16 landed on the moon. It was the second to last mission to land on the moon.
https://todayinsci.com/4/4_21.htm
This month is Eid al-Fitr.
You may want to read: