International PMO Day is celebrated on May 12 to recognize the vital role of Project Management Offices (PMOs) in ensuring project success and organizational resilience. This day aims to appreciate those who manage and organize projects within companies and government agencies. Typical customs include expressing gratitude to PMO teams through gifts, cards, or meals, and hosting events such as awards ceremonies or community picnics to celebrate their achievements. PMO professionals may also gather for meetups to reflect on their work and share experiences. The inaugural celebration took place in 2023, following its conceptualization at a PMO conference in London the previous year.