What to do if you see someone without a mask on?

I know it is an anxious time and Covid19 is a tremendous threat. We need to do something. We need to have more people masking & Social Distancing. We need to make sure this message gets across. Well for now, consider this the job CBC News! For the Opposition which every Political Science Student understands is necessity it is time to talk about my opinions on what to do when you see someone not masking?