What is a science fair?
A science fair is an opportunity for students to do an independent science project following either the scientific method or the engineering design process.
Read more here: https://www.sciencebuddies.org/science-fair-projects/science-fair
Interested in a science fair project based on photochemistry, check this out: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Chem_p095/chemistry/magic-of-photochemistry
For more ideas on what to do for your science fair project, visit https://www.sciencebuddies.org/science-fair-projects/project-ideas/list