June 20 is the 171st day of the year (172nd in leap years) in the Gregorian calendar; 194 days remain until the end of the year.
Observances
Day of the National Flag (Argentina)
Earliest possible date for the summer solstice in the Northern hemisphere and the winter solstice in the Southern hemisphere, and its related observance:
Earliest day on which Day of the Finnish Flag can fall, while June 26 is the latest; celebrated on Saturday of Midsummer's Day (Finland)
International Surfing Day (third Saturday in June, on or near Summer solstice)
Litha / Midsummer celebrations in the northern hemisphere, Yule in the southern hemisphere.
Gas Sector Day (Azerbaijan)
Martyrs' Day (Eritrea)
West Virginia Day (West Virginia)