Day of Belarusian Written Language is celebrated in the Republic of Belarus on the first Sunday in September. It aims at demonstrating the unity of the Belarusian written language and the history and culture of the Belarusian people. The first celebration took place in 1994 in the city of Polotsk.
Day of Oil, Gas and Petroleum Industry is celebrated in many former Soviet republics on the first Sunday in September. It was originally established by the presidium of the Supreme Soviet of the USSR in 1965, and after the collapse of the USSR some republics continued to observe this professional holiday.