Thanksgiving

www.publicdomainpictures.net

...is a holiday celebrated in the United States on the fourth Thursday in November.
It has been celebrated every year since 1863. Thanksgiving is one of the major holidays of the year. 
The "First Thanksgiving" was celebrated by the Pilgrims after their first harvest in the New World in 1621. This feast lasted three days, and it was attended by 90 Native Americans and 53 Pilgrims. 

In Canada Thanksgiving is celebrated on the second Monday of October.
(All according to Wikipedia)