The US has a number of holidays — official and/or cultural — of which the traveler should be aware. Note that holidays observed on Mondays are usually treated as weekend-long events. (A weekend consists of a Saturday and a Sunday.) Federal holidays—i.e., holidays observed by the US federal government—are indicated in bold italics.
* New Year's Day (January 1) — most businesses closed; brunches and football parties.
* Martin Luther King Day (third Monday in January) — many government offices and banks closed; speeches.
* Chinese New Year (January — variable date) — chinese cultural celebration
* Super Bowl Sunday (usu. first Sunday in February) — the most-watched sporting event of the year; supermarkets, bars, and electronics stores busy; big football-watching parties.
* St. Valentine's Day (February 14) — private celebration of romance and love. Most restaurants are crowded. Finer restaurants may require reservations made well in advance.
* Presidents Day (third Monday in February) — (officially Washington's Birthday) — government offices and banks closed; many stores have sales.
* St. Patrick's Day (March 17) — Irish-themed parades and parties. Expect bars to be crowded. They will often feature themed drink specials. The wearing of green or a green accessory is common.
* Easter (a Sunday in March or April) — Christian religious observances.
* Passover (one week around Easter) — Jewish religious observances.
* Memorial Day (last Monday in May) — most non-retail/tourism businesses closed; some patriotic observances; trips to beaches and parks; beginning of summer tourism season.
* Independence Day / Fourth of July (July 4) — most businesses closed; patriotic parades, cookouts and trips to beaches and parks, fireworks at dusk.
* Labor Day (first Monday in September) — most businesses closed; cookouts and trips to beaches and parks; traditional ending of summer tourism season.
* Rosh Hashanah and Yom Kippur (autumn) — Jewish religious observances.
* Columbus Day (second Monday in October) — many government offices and banks closed; sales.
* Halloween (October 31) — trick-or-treating, parades, and costume parties.
* Veterans Day (November 11) — government offices and banks closed; some patriotic observances.
* Thanksgiving Day (fourth Thursday in November) — government offices and most businesses closed; family dinners, on Friday major Christmas shopping begins.
* Christmas (December 25) — most businesses and restaurants closed the evening before and all day; exchanging gifts, Christian religious observances.
* New Year's Eve (December 31) — many restaurants and bars open late; lots of parties, especially in big cities.
http://wikitravel.org/en/United_States_of_America
http://www.statesymbolsusa.org/National_Symbols/American_Hollidays.html