Make Music New York is a yearly event that fosters free recreational music-making opportunities during the longest day of the year – June 21, i.e. tomorrow. This year over 1,000 outdoor concerts in New York City will be included in the fest, offering a diverse and exciting array of music, from large-scale spectacles to street-corner concerts in 424 public spaces throughout all five boroughs.
Some of these are particularly intriguing "group events" (within the so called "Mass Appeal" program) involving all sorts of musicophiles, including exclusive events for circuit benders, hummers, "cast iron buildings hitters" (!) and more traditional ensembles of cellos, flutes, guitars, harmonicas etc.
More info about Make Music NY and the Mass Appeal events can be found here.