April 14

On April 14, 1890, the First International Conference of American States resulted in the establishment of the Pan American Union, a precursor to the Organization of American States (OAS). Pan American Day honors this milestone in inter-American diplomacy and trade. Countries across North, Central, and South America observe the day with cultural events, educational programs, and diplomatic receptions. It promotes awareness of shared history, democratic values, and regional solidarity. Schools and community groups often host exhibitions on the history of the OAS and its role in hemispheric cooperation. Observances may include flag-raising ceremonies, lectures, and concerts. Pan American Day encourages reflection on the progress and challenges of unity in the Americas.

Observed each year on April 14, World Quantum Day highlights advances in quantum research, computing, communication, and sensing. Founded by an international coalition of scientists in 2022, the date 4/14 commemorates the ratio of a circle's circumference to its radius (4π). Events include public lectures, hands-on demonstrations, hackathons, and educational outreach for students. Organizations and universities host conferences to showcase breakthroughs and discuss quantum’s potential impact on medicine, cybersecurity, and materials science. The day encourages collaboration between academia, industry, and policymakers to accelerate development. Social media campaigns and exhibitions help demystify quantum concepts for broader audiences. By engaging enthusiasts and newcomers alike, World Quantum Day fosters a global quantum community.