When a cyclist in your area is injured or killed by a motorist, make an extra effort the next day to go for a ride. It doesn't have to be an organized ride, or even a long ride. Hell, ride a 15 minute loop around your neighborhood if you want.
Just be seen riding your bike.
Do it to make people aware we're out there. Do it to honor a fellow traveler. Do it because you're lucky enough to still be able to.