Second, about commuting vs. risk, for the past two years I also commuted when the days are long enough and the weather warm enough. The possibility of an accident is something I, and I assume most of us, prefer to close our eyes to. Every time we take our tandem out I worry. I worry less so on a solo bike because it is more agile, but I still worry about some inattentive or drunk driver hitting me from behind in a most unlikely place. Nevertheless we ride anyway. You can't run from life.
Finally, about that Mass Bike event, please do post another note about it as the day nears!