Yes I did. It was Friday so while it is too late to participate this year, at least we can get to see some of the pictures. PARK(ing) Day, as the website explains, is:

an annual, one-day, global event where artists, activists, and citizens independently but simultaneously temporarily transform metered parking spots into “PARK(ing)” spaces: temporary public parks.

And wait until you see pedal powered parkmobile, made by REBAR, the folks who started it all. This year FairerScience friend Rosa Carson (yes our Rosa, who we miss very much), set up her own Park in a parking space over by Boston City Hall. Rosa do you have any pictures? UPDATE-- check the comments for the Rosa pics)

BTW the PARK(ing) Day website has lots of pictures but I didn't see any of Rosa.