It seems that each month is now dedicated to something, someone, some group, etc. Despite the excessiveness of this dedication system, it's not a bad technique for raising awareness.
In Blacksburg, April is the month for the bike challenge. Basically promoting cycling in all shapes and forms. In the bike challenge you log your miles for the month. The reason is simply to promote biking and the thousands of benefits...on the website they list a worthy top ten.
Check it out and register. If you need a bike, you can get one for super ridiculously cheap at the Blacksburg Bike Co-op. I can get you more info on that if you are interested.
Here is the bikechallenge site: bikechallenge.org.vt.edu