Larks' Day in Latvia
Larks' Day in Latvia is held on March 17. This event in the second decade of the month March is annual. 
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In ancient Latvia, Kustonu Diena was held on March 17, followed the next day by Bindus Diena (Feast day of St. Benedict). It was associated with insects. To ward against insects, nothing could be planted on this day. The flour-mill was rotated nine times in the morning, when sparrows were driven from the homes, to ward against them for the summer. Spinning linen was forbidden for attracting wolves. Embroidering and sewing forbidden, or else worms will infect crops and moles will dig holes, respectively.
There are various beliefs about this day, but the main one is that you should not bring anything home from the forest to keep snakes away. Who knows whether these beliefs are true today?
Similar holidays and events, festivals and interesting facts
Buzzards Day on March 15 (Buzzards are another word for turkey vultures, a species of vulture protected by the Migratory Bird Treaty Act of 1918);
National Animal Poison Prevention Week in USA on March 17 (Third Full Week in March);
Gertrude of Nivelles Day on March 17 (“The Cat Lady of the Catholic Church”);
World Sparrow Day on March 20
World Frog Day on March 20 (celebrated since 2009);
MeatOut Day in Colorado, US on March 20
Puppy Day on March 23
Cuddly Kitten Day on March 23
World Bear Day on March 23