To add it to your own calendar: 
Historic Route 66 Calendar of Events
June
9
June
9
Old Tyme Picnic
Route 66 state park in Eureka, MO
June
9
June
23
Rebel Car Club Cruise Night
Waylan's Ku-Ku Burger Drive-In in Miami, OK
June
27
Decomissioning birthday
Route 66 was decomissioned on June 27th, 1985.
July
4
Independence Day
USA
All over the route, many Independence Day related festivity will be held.
July
28
Rebel Car Club Cruise Night
Waylan's Ku-Ku Burger Drive-In in Miami, OK
August
25
Rebel Car Club Cruise Night
Waylan's Ku-Ku Burger Drive-In in Miami, OK
September
7-9
Atlanta Fall Festival
Atlanta, IL
September
9
Route 66 Car and Bike Show
Braceville, IL
September
22
Rebel Car Club Cruise Night
Waylan's Ku-Ku Burger Drive-In in Miami, OK
October
5-6
October
31
Halloween
November
11
Route 66 Birthday
Route 66 was officially established on November 11th, 1926.
December
25
Christmas
2013
January
1
New Year
If you find information on an event related to Route 66 missing in the above list, please let us know the details.