I'll be adding to the list as we go. The list will have events running through October.
Please let me know if you have any suggestions or additions!
April 6 - November 2013 (every weekend)
Smorgasburg - Brooklyn Flea Food Market (W'burg)
East River State Park at Kent Ave and N. 7th St.
Saturdays11am-6pm, Rain or Shine
http://www.smorgasburg.com/
April 6 - November 2013 (every weekend)
Smorgasburg - DUMBO
Tobacco Warehouse (30 Water St.)
Sundays 11am-6pm, Rain or Shine
April 20 - Fall
Fulton Stall Market
Every Saturday & Sunday
beginning April 20 & 21 from 11:00 am to 5:00 pm
Under the awning of the Fulton Market Building at the South Street Seaport
South Street between Fulton and Beekman Streets, across from Pier 17.
http://www.fultonstallmarket.com/information
Saturday April 27 - October
Hester Street Fair
Corner of Hester and Essex St
11AM-6PM
http://www.hesterstreetfair.com/
Long Island City Food & Flea June 15 - November (weather permitting)
46th St and 5th Street, LIC
10AM - 6PM
http://www.licflea.com/
http://www.bbg.org/visit/event/sakura_matsuri_2013
Saturday July 20th
Earth Awareness Fair at Herald Square
Broadway between 35th-39th St
10AM-6PM
Sunday July 21
Fulton Street Fair
Fulton Street from Water to Gold St
10AM-6PM
Sunday July 21
Rio De Brazil Block Party
46th St between 6th and 7 ave
10AM-4PM
Friday July 26
Grand Central Carnival
41st St from Lexington to 3Ave
10AM-4PM
Saturday July 27
Festival of the Americas
6th Ave between 42nd and 57th Street
10AM-6PM
Sunday July 28
Madison Ave Summer Fair
Madison Ave between 42nd and 57th Street
10AM-6PM
July 31 to August 4
Maine Lobster Festival
Rockland, ME
9AM-8PM
http://www.mainelobsterfestival.com/
Saturday August 3
The Summer Seaport Festival
Water Street from Fulton to Broad St
11AM-6PM
Sunday August 4
Lexington Ave Summerfest
Lexington Ave between 42 and 57 St
10AM-6PM
Saturday August 10
Times Sq Summer Fair
45th Street between 5th ave to 7th ave
10AM-6PM
Friday August 16
Bowling Green Park Fair
Broadway and Whitehall St
9AM-6PM
Saturday August 17
The Great Irish Festival
6th Ave between 42 St and 56 St
10AM-6PM
August 22-Sept 2
The Great NYS Fair
New York State Fairgrounds in Syracuse, N.Y.
8AM-9PM
http://www.nysfair.org/
Friday August 23
Irving Place Fair
Irving Place from 14th - 15th Street
10AM-4PM
Sunday August 25
52nd Street Jazz Fair
52nd Street between 6th and 7th Ave
10AM-4PM
Saturday August 31
World Trade Center Fair
Liberty Street between Broadway and Trinity Place
11AM-6PM
Saturday August 31
Herald Sq Block Party
33rd St between 6th and 7th Ave
10Am-4PM
Sunday Sept 1
Annual Brazilian Day Festival
6th Ave between 42st and 56 St and 46th St from Madison to 7th Ave
Saturday Sept 7
Grammercy Park Neighborhood Fair
3rd Ave between 14th Street and 23 St
10AM-6PM
Sunday Sept 8
43rd St Block Party
43 St between 6th and 7th Ave
10AM-4PM
Sept 12-22
San Gennaro Festival
Mulberry St from Canal to Houson
http://www.sangennaro.org/
Friday Sept 13
Midtown East Block Party
54th St between Lexington and 3 Ave
10AM-4PM
Sunday Sept 15
Eighth Ave Festival
8th Ave between 42nd and 57th St
10AM-6PM
Saturday Sept 21
Hammer and Claws Blue Crab Fest
The Tunnel @ The Terminal Stores
269 11th Ave, Chelsea, NYC
http://www.hammerandclaws.com/
Saturday Sept 21
Broadway Autumn Fair
Broadway between Waverly Place and 14th St
10AM-6PM
Friday Sept 27
Grand Central Fall Festival
41st between Lexington and 3 Ave
10AM-4PM
Sept 28-29
Hudson Valley Garlic Festival
10AM-5PM
Cantine Veterans Memorial Complex in Suagerties, NY
http://hvgf.org/
Saturday Sept 28
Sixth Ave Fair
6th Ave between 42nd St and 56th St
10AM-6PM
Sunday Sept 29
NYC Oktoberfest
Lexington Ave between 42nd and 57th St
10AM-6PM
Saturday/Sunday October 19-20
Oyster Bay Oyster Festival
Theodore Roosevelt Memorial Park
http://www.theoysterfestival.org/index.php
11AM-5PM