The Day of Photonics is an online event held on 21st October 2022. On 21 October 1983, the General Conference on Weights and Measures adopted value for the speed of light. On the occasion of this anniversary, every year hundreds of activities are voluntarily organized around the world to promote photonics. Every company, school, organization, association, university, and individual is invited to participate. Reach out to their community to raise awareness about what is photonics and why it is important. Promote the role of your organization in the photonics ecosystem and value chain.