Not technically in Sunset Park, but it's an easy bus ride (or R train ride) to Open Source Gallery.
Opening this Friday, Jacob Ouillette's "Painted Space" will begin its month-long stay at Open Source Gallery at 255 17th Street (and 5th Avenue). The opening will also feature a short play by Anne Phelan called "Brooklyn Lighthouse." The play will be presented twice during the 7 PM to 10 PM opening.
Both admission to the gallery and the play are free.