How many American festivals do you know?

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America as a nation of immigrants, it has many festivals. The following are some of the traditional festival in America: 1/1 (New Years Day) 2/12 (Lincolns Birthday) 2/14 (St. Valentines Day) 2/18 (Washingtons Birthday) 3/17 (St. Patricks Day) 4/1 (All Fools Day) 4/** (Easter) 5/** (Arbor Day) (2th Friday in May) 5/** (Mothers Day) (2th Sunday in May) 5/** (Memorial Day) (May last Monday) 6/14 (Flag Day) 6/** (Fathers Day) (3th Sunday in June) 7/4 (Independence Day) 9/** (Labor Day) (September Labor the first Monday) 10/12 (Columbus Day) 10/** (Veterans Day) (October 4th Monday) 11/1 (Halloween) 11/** (Thanksgiving Day) (November last Thursday) 12/25 (Christmas) Notation:**said no definite date. Do you know all the holidays in America?