From SF Bike Party:

In honor of The American Heart Association's National Wear Red Day, we ask that you celebrate bike party by wearing red. Bike Party helps keep our hearts happy and healthy all year round. We ♡ Bike Party! What do you ♡?
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Since opponents of Prop. K can't drive on it, may as well make it into a park too
PBAC members decide they're done wasting their time with a city government that puts parking and loading above safety