World Amateur Radio Day, held on April 18 each year, is celebrated worldwide by radio amateurs and their national associations which are organized as member-societies of the International Amateur Radio Union (IARU). It was on this day in 1925 that the IARU was formed in Paris. American Radio Relay League (ARRL) Co-Founder Hiram Percy Maxim was its first president.
- ARRL World Amateur Radio Day Website – https://www.arrl.org/world-amateur-radio-day
- IARU World Amateur Radio Day Website – https://www.iaru.org/on-the-air/world-amateur-radio-day/