From the GrowNYC website:
Friday, July, 15th - Greenmarket's 40th Birthday Party!
North end of Union Square, 4pm-9pm
Live music from the Jazz Foundation of America.
The Union Square Summer Fridays series will highlight local restaurants selling prepared dishes and brewers, cideries and wineries that use local ingredients in their craft beverage products. Restaurants will join the regular Friday Greenmarket line up and serve seasonally inspired dishes alongside a beer garden selling local beer, wine and hard cider.
These events are free and open to the public and hosted in collaboration with Union Square Partnership