In Boise, we are fortunate. In other communities, bike activism occurs as "Critical Mass Rides" and other confrontational events. By and large, bikes are accepted here, even embraced by a large percentage of the citizenship.
For the past few years, in May we've celebrated Boise Bike Week. This year, it's May 16-22. Check out the website and schedule... it's getting better organized, with more events, every year.
You Boise-area peope... pencil in a couple events right now. I'd personally recommend the Pedal Power Parade on Saturday afternoon. It's not as exuberant, perhaps, as the Fat Tire Parade later in the year, but it's a great way to gather in a relaxed setting with like-minded bicycle enthusiasts.