May 20

World Bee Day, established by the UN in 2017 and celebrated on May 20, highlights the importance of bees and other pollinators for ecosystems, food security, and biodiversity. The date honors the birthday of Anton Janša, a pioneer of modern beekeeping. Events worldwide include educational workshops, beekeeping demonstrations, and campaigns against pesticide use. The observance encourages community action to protect pollinator habitats, promote sustainable agriculture, and support scientific research.

World Metrology Day on May 20 commemorates the anniversary of the signing of the Metre Convention in 1875, which established the International Bureau of Weights and Measures. The day promotes the importance of measurement standards in science, industry, trade, and daily life. Each year features a theme highlighting developments such as digitalization of measurements or climate research. Workshops, seminars, and exhibitions are held by metrology institutes worldwide to showcase innovations and encourage collaboration.