Independence Day (holiday)

From Tardis Wiki, the free Doctor Who reference

Independence Day, sometimes called the Fourth of July, (TV: Immortal Sins) was an American holiday held every year on 4 July to commemorate the signing of the Declaration of Independence on 4 July 1776. (PROSE: Time Traveller's Diary) Americans of subsequent generations celebrated Independence Day with fireworks, with big cities like Chicago having memorably large displays. (PROSE: The Gunfighters)