Holidays
100
2013 brought the very rare coincidence of Thanksgiving & this religious holiday
What is Hanukkah
200
In 2011 the 250th edition of a real oldie hit parade marched up New York's 5th Avenue on this date
What is St. Patrick's Day (March 17th)
300
March 2 is a holiday in this state, celebrating its 1836 independence
What is Texas
400
There's a day of the week in this word, a synonym for Pentecost
What is Whitsunday
500
It's believed that Imhotep helped create this calendar in which new year is usually September 11
What is the Coptic calendar