If you mean, what is the National Day? It is July 14th, it is the equivalent of Independance day in the US. It actually commemorates the siege of the Bastille in 1789 which during the French Revolution marked the end of the monarchy and the beginning of the First Republic.
Every year, on the night of the 13th we have huge fireworks everywhere (the biggest one is right underneath the Eiffel Tower. It is beautiful, but I wouldn't recommend to anyone to mingle with 6 million of drunk people gathered at the same place). Then on the morning of the 14th, there is a military parade on the Champs-Elysées.
2nd October
National Peanut Festival was created in 1938.
Le festival d'Avignon
Guyana's National Festival is Mashramani which is celebrated on the 23rd of February.
It is a festival in France and it means 'The Festival of light!'
The first National Sports Festival for Women was in 1975.
National Queer Arts Festival was created in 1998.
National Young Writers' Festival was created in 1998.
National Youth Festival - India - was created in 1995.
Nandikar's National Theatre Festival was created in 1984.
National Buffalo Wing Festival was created in 2002.
National Festival of Community Theatre was created in 1927.