University of Arizona researchers, community and student groups, and local leaders will provide talks, tours, art, information and activities for the whole family. Learn how Tucson is harnessing the power of the sun and how you can be a part of it.  

If you are unable to attend in person, the talks will be live-streamed. The event program will be emailed, including how to connect to the livestream, to all registered participants prior to the event.

SunDay is a national day of action on September 21st, 2025, celebrating the unstoppable rise of clean energy. We’ll come together to showcase the power of the sun and wind, the energy sources that can power our world without pollution.