Independence Day (July 4)
Memorial Day (Last Monday in May)
Lincoln's Birthday (February 12)
Washington's Birthday (Third Monday in February)
Veterans' Day (November 11)
Armed Forces Day (Third Saturday in May)
Labor Day (First Monday in September)
Flag Day (June 14)
Citizenship Day - Formerly known as Constitution Day (September 17)
Columbus Day (Second Monday in October)
Inauguration Day (January 20)
State and Local Holidays
Election Day
New Year's Day (January 1)
Mother's Day (Second Sunday in May)
Father's Day (Third Sunday in June)

It is the universal custom to display the national flag only from sunrise to sunset on buildings and on stationary flagstaffs in the open. It should not be displayed on days when the weather is inclement unless constructed of all weather materials. The U.S. flag may be displayed at night when it is desired to produce a patriotic effect, and when proper illumination is provided.

Display the U.S. flag on all days that weather permits but especially on national and state holidays and other days that may be proclaimed by the President of the United States. On Memorial Day, the U.S. flag should be half-staffed until noon.

The U.S. flag should be displayed on or near the main building of every public institution, during school days in or near every schoolhouse, and in or near every polling place on election days.

Always hoist the U.S. flag briskly, Lower it ceremoniously.

When it is to be flown at half-staff, the flag is first raised to the peak and then lowered to the half-staff position. When being lowered for the day it should first be raised to the peak.

Never in any way should any disrespect be shown the U.S. flag.

The U.S. flag should never be dipped to any person or thing. Regimental colors, State flags, and organization or institutional flags are dipped as a mark of honor.

The U.S. flag should never be displayed with the union down except as a signal of dire distress (such as at war).

Th U.S. flag should never be carried horizontally, but always aloft and free.

Always allow the U.S. flag to fall free - never use the U.S. flag as drapery, festooned, drawn back or up in folds. For draping platforms and decoration in general, use blue, white and red bunting. Always arrange the bunting with blue above, the white in the middle and the red below.

The U.S. flag should never be fastened, displayed, used or stored in a manner which will permit it to be easily torn, soiled or damaged in any way.

Never use the U.S. flag as a covering or drape for a ceiling.

Never place anything on the U.S. flag. The U.S. flag should never have placed upon it, or attached to it, any mark, insignia, letter, word, figure, design, picture or drawing of any nature.

Never use the U.S. flag for receiving, holding, carrying or delivering anything.

The U.S. flag should not be embroidered on such articles as cushions, handkerchiefs, and the like, printed or otherwise impressed on paper napkins or boxes or anything that is designed for temporary use and discard; or used as any portion of a costume or athletic uniform. However, a flag patch may be affixed to the uniform of military personnel, firemen, policemen, and members of patriotic organizations. Advertising signs should not be fastened to a staff or halyard from which the flag is flown.

When the U.S. flag is in such condition that it is no longer a fitting emblem for display, it should be destroyed in a dignified way, preferable by burning, privately.

The above information taken from AMVETS National Service Foundation Flag Etiquette, Third Printing.