There's a Groupon going on right now for this 5K ($27 for the entry, bib, T-shirt, cheer stick and admission to the after-party). It's filled with glow sticks, black light and pumping Electronic Dance Music. Plus the after party seems to be pretty fun as well. This deal expires AUGUST 8TH so if you're going to do it, sign up ASAP! After August 8 it's $55. I'm signing up with my roommate!
Here's the link to the Groupon: http://www.groupon.com/deals/neon-splash-dash-8