New York through the year (and a bit of Sydney as well)

January

• January 1 - Public Holiday (New Year's Day)
• 3rd Monday in January - Public Holiday (Martin Luther King Day)

Sydney:

• 2nd half - Australian Open Tennis (Melbourne)
• January 26 Australia Day
• January- Feb Open Air Cinema Sydney Harbour
• January- Feb Moonlight Cinema Centennial Park Sydney

February

• ? Empire State Building Race
• Mid February - Public Holiday (President's Day)

Sydney:

• February- March Gay and Lesbian Mardi Gras

March

• March 17 - St Patrick's Day Parade 5th Ave
• March 25 - Greek Independence Day Parade 5th Ave

April

• Easter Sunday - Easter Parade 5th Avenue

May

• last Monday of May - Public Holiday (Memorial Day)

June

• June-October - Shakespeare in the Park
• June- August Central Park Summer Stage
• every Wednesday June-August Summer in the Square
• Bryant Park Film Festival June-August
• late June - Lesbian and Gay Pride Day Parade

July

• June-July- Wimbledon (London)
• July 4 - Public Holiday (Independence Day) Macy's Fireworks Display

August

• late August-early September - US Open Tennis Championship at Flushing Meadows

September

• 1st Monday in September - Public Holiday (Labor Day) end of the summer. Labor Day Parade
• Third week- San Gennaro street festival in Mulberry Street, Little Italy
• 10 Sep? Broadway on Broadway

October

• 2nd Monday in October - Public Holiday (Columbus Day) Columbus Day Parade
• October 31 - Halloween Parade
• Last Sunday in October or 1st Sunday in November - New York Marathon

November

• 1st Tuesday in November - Public Holiday (Election Day)
• November 11 - Public Holiday (Veterans Day)
• 4th Thursday in November - Public Holiday (Thanksgiving Day) Macy's Thanksgiving Day Parade

December

• early December - lighting of the Rockefeller Center Christmas tree
• December 25 - Public Holiday (Christmas Day)
• December 31 - Times Square

NYC

Sydney