Preview a new work from artist Emeka Ogboh, a monument to sound and collective memory as part of the citywide Monument Lab exhibition, housed at the Free Library of Philadelphia (Parkway Central Library). Join Mural Arts Philadelphia during the Parkway Centennial celebration on Friday, September 8, on the Library’s fourth floor Skyline Terrace from 6–9 p.m. for sound art and an amazing city view. FREE.