Рассматривая различные случайные события при выполнении одних и тех же условий G, нетрудно убедиться в том, что каждое из них обладает какой-то степенью возможности: одни большей, другие меньшей

Overview[edit]

As of June 2021, there are eleven annual federal holidays in the United States, and one additional quadrennial holiday (Inauguration Day).^[2] Pursuant to the Uniform Monday Holiday Act of 1968 (effective 1971), official holidays are observed on a Monday, except for New Year's Day, Juneteenth, Independence Day, Veterans Day, Thanksgiving, and Christmas.^[3]

A jack-o'-lantern, one of the symbols of Halloween

While all current federal holidays have also been made public holidays in all 50 states, each state is not bound to observe the holidays on the same dates as the federal holidays. Many states also have additional holidays that are not observed by the federal government.^[4] Many businesses likewise observe certain holidays as well, which are also not mandated by any government agency.

Saint Patrick's Day parade in Atlanta, 2012

Since 2000, some city and state-level celebrations of Malcolm X Day and Rosa Parks Day have been created, in addition to the federal Martin Luther King Jr. Day, to embrace the African American community in the form of festivals and parades. Illinois and Berkeley, California are two places where Malcolm X is honored by a legal holiday with offices closed, whereas Missouri honors Rosa Parks on her birthday.^[5][6] Today, the United States is the 85th most ethnically diverse country in the world. Many workplaces celebrate religious observance as well as ethnic holidays, such as Saint Patrick's Day, Kwanzaa, Diwali, Mardi Gras, and Cinco de Mayo, as a matter of best practice.^[7]
While the popularity of each public holiday cannot easily be measured, the holiday with the highest greeting card sales is Christmas.^[8] Major retail establishments, such as shopping malls and centers, close only on Thanksgiving and Christmas, but remain open on all other holidays (with early closings on Christmas Eve and New Year's Eve, and sometimes on other major holidays). In the face of a rapidly tightening retail market in the 2010s, retailers have increasingly been opening on Thanksgiving evening and night to extend Black Friday and the holiday shopping season.^[9] Virtually all large companies observe and close on the major holidays (New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas). Some non-retail businesses close on the day after Thanksgiving, while others (such as federal banks and post offices) are not allowed to close that day. Some smaller businesses normally open on Sundays will close on Easter Sunday if they expect to have very few customers that day.