Bastille Day celebration by Dee22
If you are in Paris around July 14th, you can miss the Bastille Day parade going on in the center city. Most people will be going to Champs-Elysees early on to be ready for the start of the parade, but you can also choose to take a stand somewhere at the route following Champs-Elysees, to get a view of the marching military-corps, policemen, firefigthers or maybe even the president.
There will be massive crowds in the streets, and most of the center city will be guarded with fences, so it's hard to get around in town this day. In top of that, all the metro stations are closed, as it's a national day.
In the evening there will be a huge firework-show near the Eiffel Tower...didn't get to see that in 2003 though, as I were sitting in a bar :0) - but it should be very beautiful!