Holidays at 31 may of 2021 (date 31.05.2021)
Day chemist — professional holiday of workers of the chemical industry, is celebrated on the last Sunday of may in Russia, Belarus, Ukraine.
"the Day of the Russian advocacy” States in the Russian Federation annually on may 31.
World no tobacco day was first announced on may 31, 1988. His appearance was associated with tobacco problem, which was already burning in the 20th century.