Greenwich Flea Market, Sunday October 4th 2015, 10AM to 4PM. Flea Markets are held twice a year on the first Sundays in May and October at the main Greenwich Town parking lot (Island Beach lot) just off of Exit 3 ramps of I-95. Run by Greenwich Knights of Columbus. $90 per vendor gets 3 parking spots in the lot. Long established event is very well attended by vendors and the public.