Children's Week, also known as Week of the Wardens, is celebrated by both the Horde and Alliance in Orgrimmar and Stormwind City. At the beginning of May, and lasting for a week, it is a time for heroes of both sides to give back to the innocents of war...the orphans!
Children's Week is also held for both factions in Shattrath City and Dalaran for higher level characters.
Many Azerothian holidays are based off real-life counterparts. Children's Week generally occurs in early May, and is likely based off of Japan's Children's Day which is held on May 5th.
In 2020, Children's Week will be held from May 1nd to May 8th.