Remembrance Day for Martyrs and Disabled in Afghanistan

Shōwa Day in Japan on April 29 (昭和の日 is celebrated in Japan to commemorate the birth date of Emperor Showa or Hirohito, the emperor of pre and post-World war II);

Cassinga Day in Namibia on May 4;

Dave Brubeck Day on May 4 (David Warren Brubeck (December 6, 1920 – December 5, 2012) was an American jazz pianist and composer, considered to be one of the foremost exponents of cool jazz. In the United States, May 4 is informally observed as "Dave Brubeck Day". In the format most commonly used in the U.S., May 4 is written "5/4," recalling the time signature of "Take Five", Brubeck's best known recording);

Day of Homage to the Spanish deported and deceased in Mauthausen and other camps and to all victims of Nazism in Spain on May 5;

UN remembrance and reconciliation DAY on May 9 (8–9 May);

Lost Sock Memorial Day on May 9;