First "Sesame Street" balloon added to the Macy's Thanksgiving parade:

Kermit the Frog
On Nov. 24, 1977, the Kermit the Frog balloon debuted at the Macy's Thanksgiving Day Parade.
Source: New York Magazine, 11/9/2009

 
   
  Year St. Patricks' Day became a national holiday in Ireland:

1903

Source: Sunday Oregonian, 3/13/1994

 
   
  Savannah dyes the Savannah River green:

March 17, 1961
The first city to dye its river green for St. Patricks' Day.
Source: Chicago Tribune, 3/13/1999

 
   
  First St. Patrick's Day parade in America:

March 17, 1737
The first recorded celebration of St. Patrick's Day in the New World occurred in Boston on March 17, 1737, when 26 Protestant men from the Charitable Irish Society gathered to celebrate the holy day of St. Patrick. Catholics were not officially allowed into the organization until 1764.
Source: Boston Globe, 3/14/2004