So tomorrow is the last Friday of the month, which means it's time for Critical Mass, a monthly bicycle protest thingie. This month's ride will likely focus on Lucy Parsons, a labor activist involved in the Haymarket riot. After the ride there will be a play about Lucy Parsons at the Handlebar. Also, if you want to sample a bit of Chicago's bike culture and see what's in store for the ride tomorrow, check out this month's Derailleur.