One Boston Day, observed on April 15 every year, is an American holiday born after the events of the tragedy of the Boston Marathon bombings in April 2013. It is a holiday born by the death of some, injuries to many others, and the emergency responders’ bravery. These include police and other personnel who immediately took charge of the situation and did their best to get as many people as possible to safety following the blasts. One Boston Day serves as an opportunity to celebrate the resilience and strength shown by the people of Boston and those worldwide in responding to the Boston bombings.
International Microvolunteering Day

International Microvolunteering Day is observed annually on April 15. It’s to raise awareness of the microvolunteering concept and how it can empower worthy causes and individuals to make the world better through bite-sized actions. It’s also an opportunity for micro-volunteering platforms, volunteer-involving organizations, and individuals to connect in a synced effort to further their contributions and show the potential of the micro-volunteering concept.
Pan American Day

Pan American Day is marked on April 14 every year. The day celebrates the First International Conference of the American States, which took place on April 14, 1890, and resulted in the formation of the International Union of American Republics. It was the precursor to the Organization of American States (OAS). The day was first commemorated on April 14, 1930, after the organization proposed it in 1930. This day is often celebrated with parades, plays, orchestra performances, art displays, and pageants.