The Feast of the Transfiguration of Jesus is observed by various Christian denominations. It is celebrated on August 6 by most churches that follow the Gregorian calendar. This date was chosen by Pope Callixstus III to commemorate the 1456 Siege of Belgrad.
Railroad Workers' Day is a professional holiday celebrated in some former Soviet Republics (namely Russia, Belarus and Kyrgyzstan) on the first Sunday in August. It was first established in the late 19th century to honor Emperor Nicholas I of Russia.
Friendship Day is an informal holiday celebrated in some countries on the first Sunday in August. It was initially created by the greeting card industry in the early 20th century.