However, (with several exceptions) there is no requirement that government or business close on these days, and many members of the general public may not be aware that such holidays even exist.

Many of these observances designated by Congress are authorized under permanent law under Title 36, U.S. Code, in which cases the President is under obligation to issue an annual proclamation.

In addition to annual commemorative events, the President may proclaim a day or period designated for mourning or prayer after the death of noted officials including U.S. Presidents and Chief Justices of the United States or after major tragic events or disasters with serious casualties.

[2] The policy of issuing proclamations calling for the observance of special days or events is in 1 CFR Section 19.4, which allows for the responsibility for the preparation and presentation of proposed proclamations calling for the observance of special days, or events to the Director of Management and Budget to such agencies as deemed appropriate.

[3] Bold text indicates a public holiday, on which most government agencies and major businesses are closed.