You probably know that 14 July is Bastille Day, but do you know what it's called in French? (Hint, it's not "jour de Bastille.") Do you know the history behind Bastille Day, or how it's celebrated in France? This page has links to everything you could possibly want to know.
The best way to encourage students to speak French in the classroom is to make sure that they know how to say all the things that they need to say. Once you teach them these useful words and phrases, your students should be able to avoid speaking English during any normal classroom interaction.
Eager for a new way to work on your French listening comprehension? Take a look at Yabla French, a subscription site with a massive collection of original videos featuring native speakers to help you learn and practice French at any level.