From the Walnut Creek Downtown Association website:
PARK(ing) Day is an annual worldwide event that invites artists, designers, and citizens to transform metered parking spots into pop-up parks for an afternoon. Last year’s PARK(ing) Day celebration in Walnut Creek was a great success, bringing a splash of color and fun to several parking spots on Locust Street. Participants included Greenbelt Alliance, Sustainable Walnut Creek, the Gardens at Heather Farms, Generation Green, the East Bay Regional Park District, and Diablo Valley College.