With Spring finally "sprung," and the last day of school soon approaching -- neighbors' minds and hearts turn to that annual homage to communal grilling, sidewalk chalk, water fights, and big-and-little-people tricycle races. The Block Party is a sacred thing in many places across the country -- not least in Oak Park and River Forest. Here, block party fun is serious business. And to some local citizens, greening their block parties is seriously cool and important business. The great news is that the villages of Oak Park and River Forest are both supporting GREEN BLOCK PARTIES this year! Why? Read on for the why's, who's, what's, and how's of green block parties.