June 20 is the 171st day of the year (172nd in a leap year) in the Gregorian calendar. The Zodiac sign for individuals born on this day is Gemini.
June 20th is the Day of the National Flag in Argentina, in Spanish it is Día de la Bandera Nacional. This holiday is dedicated to the Argentine flag and its creator, Manuel Belgrano. Belgrano died on June 20, 1820. It was designated as a holiday in 1938.http://www.buenostours.com/argentina-flag-day
This day is also the earliest date for the Summer Solstice. When the Earth's axial tilt is closest to the sun at its maximum of 23° 26', the Summer Solstice occurs. Although this happens at a specific moment, it is celebrated on the day that it occurs, rather than the exact moment of occurrence. The Summer Solstice occurs between June 20th and June 21st, depending on the shift of the calendar.
The United Nations General Assembly made the decision on December 4, 2000 that beginning in 2001, June 20th would be observed as World Refugee Day. Resolution 55/76 notes that this date in 2001, marks the 50th anniversary of the 1951 Convention relating to the Status of Refugees. The Organization of African Unity (OAU) agreed to allowing the international holiday coincide with African Refugee Day.http://www.un.org/depts/dhl/refugee/