Photos below are from the Neon Vibe 5k fun-run, which was held at Willow Metro Park in the Detroit, MI area. It started at dusk and waves of 300 people launched at a time. Along the route were five stations setup to douse participants with neon powder and water. It was quite a mess, but in a good way!
The area had a fill of black-lights setup, a concert stage, concessions, etc. It was a mighty fine night-time event with a load of people attending, and a lot of fun continuing after the run.