Bastille Day (a.k.a. "14 Juillet" in French) is the French national holiday. It commemorates the 1790 Fête de la Fédération, held on the first anniversary of the storming of the Bastille fortress-prison in Paris on 14 July 1789. The storming of La Bastille was seen as a symbol of the uprising of the modern nation during the French Revolution.
Each year on July 14, festivities in France begin with an official military parade on the Champs-Élysées avenue in Paris, in presence of the President of the Republic. Then at night, in every town and village in the country, you'd have massive fireworks, as well as a traditional "bal des pompiers" - a popular evening ball held at the local fire station, with live music bands, street food, cute guys in uniforms and people from all generations dancing the night away.