International Heraldry Day
International Heraldry Day is held on June 10. This event in the first decade of the month June is annual. 
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On June 10 we pay tribute to an ancestral form of artistic expression. It is the International Day of Heraldry, an initiative proposed by the Polish Heraldry Society.
Heraldry comes from the masculine noun herald, i.e. the one who announced and described the knights entering the tournament, the one who announced the facts, the one who carried the declarations of war as a public official in the Middle Ages. In addition to being an adjective, heraldry is a noun denoting the science that helps us to understand and properly compose coats of arms, or the code of rules that allows us to correctly represent and describe coats of arms.
Strictly defined, it denotes that which pertains to the office and duty of a herald, whose visible head was the king of arms; that part of his work dealing with coats of arms is properly called armory, but in general usage heraldry has come to mean the same as armory. It is a discipline concerned with the design, display and study of coats of arms, as well as related disciplines, the study of ceremony, rank and pedigree.
Similar holidays and events, festivals and interesting facts
Coral Triangle Day on June 9 (The CTD was first held on June 10, 2012, as a regional interpretation of World Oceans Day. During the 8th Coral Triangle Initiative on Coral Reefs, Fisheries and Food Security (a multilateral partnership to safeguard the Coral Triangle's marine and coastal biological resources) Senior Official Meeting, member countries declared to designate the Coral Triangle Day to be held annually. The region covers the exclusive economic zones of six countries: Indonesia, Malaysia, Philippines, Papua New Guinea, Solomon Islands, and Timor-Leste);
International Accreditation Day on June 9
International Archives Day on June 9 (International Council on Archives);
World Pet Memorial Day on June 10 (Held on the second Tuesday of June);
World Art Nouveau Day on June 10 (The first World Art Nouveau Day 2013 was organized by the Hungarian Museum of Decorative Arts, Budapest - IMM, in cooperation with the Szecessziós Magazine);
World Ice Cream Day on June 10
World Handicrafts Day on June 10
World Day for the Fight against Prostate Cancer on June 11
International Day of the Caregiver on June 11