Earth Day may be bullshit, but Group Health's Bike Commute Challenge has got some brains behind it. They've realized that asking people to do something good for themselves and/or the environment for just one measly day doesn't do much for either party involved. Participants don't get a longer-term perspective on how their activity of choice might be enjoyable and make them feel better, and one day does not a better environment make, in truth.
Dear event organizers, take a tip from Group Health and the Cascade Bicycle Club: If you want to raise awareness, get people to do something for longer. If it was just Bike to Work day, a lot of people would try it, probably have a slightly miserable time, be sore the next day, and say fuck it. But the next day would likely be better. If you can get them to keep going, you're much more likely to have a few more bike commute converts at the end of a month.
Get them hooked. Better yet, offer them schwag, because Americans will do all kinds of ridiculous things for free stuff. In fact, you're probably reading this post primarily because we titled it Free Stuff, for chrissake.
The Challenge starts next Monday and lasts the whole month of May. Get a team together at work, or go renegade solo style. Either way, there's lots of prizes in the offering, including surprise instant giveaways by Challenge "ambassadors" lurking about town if you're spotted during your commute wearing your special-issue leg band.

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Thanks for the shout out about the Group Health Commute Challenge. You're absolutely right that it takes time to change habits and see a measurable outcome.
Last year's 3,700+ riders burned a collective 14.4 million calories (the equivalent of 34,000 Quarter Pounders), reduced pollution by nearly 1/2 million pounds of CO2, and removed approximately 1,500 cars a day from the road. Now that's really something!
I disagree that one-day events aren't valuable though. Everyone has to start somewhere. Starbucks Bike to Work Day (also produced by Cascade Bicycle Club) is a great day to ride to work for the first time. Not only are there 10,000+ folks on the road to help you find your way, but countless bike shops are out to help with all sorts of mechanical issues and you can get lots of free stuff.
If people are intimidated by a month-long, bike-commuting committment, I hope they'll at least make a start on Starbucks Bike to Work Day on Friday, May 19th.
Thanks for the extra info Carry! And, the kick in the ass about day-only events. Our snark gets the best of us sometimes.
The one thing I wish was changed about the Commute Challenge was some concession for those with a longer commute. On a bike, my commute is 1.5 hours in one direction, so I rarely bike both ways on the same day. I tend to bus in and bike home, and would love to still be able to participate somehow, especially given that just my ride home is more than some folks log in a couple of round-trip days!