What people celebrate, how they spend the day and what they eat. 22 festivals from 3 countries so far, with more added every week.
JapanA national holiday since 1948 to celebrate children's happiness. It grew out of Tango no Sekku, an old festival for boys.
On the day: Families fly koinobori, carp-shaped windsocks, from poles outside the house: a black carp for the father, a red one for the mother and one for each child. Inside, they display a small samurai helmet or suit of armour.
MexicoRemembers the victory of the Mexican army over a larger French force at the Battle of Puebla on 5 May 1862. It is often mistaken abroad for Independence Day, which is in September.
On the day: The city of Puebla holds a military parade, festivals and re-enactments of the battle. In the rest of Mexico the day is mostly marked with ceremonies.
JapanHanami, "flower viewing", is the old custom of enjoying the short life of the cherry blossom (sakura). The Japan Meteorological Agency follows the "cherry blossom front" as it moves up the country each year.
On the day: Friends, families and work colleagues spread blue sheets under the trees in parks and have long picnics with food and drink. At night, lanterns light the trees for yozakura, "night cherry blossom" viewing.