Hi, I think that in Montpellier as in the rest of France, the most important day would be le 14 juillet (Bastille Day) This is France’s National Day and commemorates the storming of the “Bastille” (a prison) in 1789, which triggered the French Revolution.

Bonjour 12-30 July 2010. During last three weeks in July, more than 100 concerts in Montpellier, suburbs and in all Languedoc-Roussillon. Symphonics lyrics concerts, operas, jazz and world music concerts, reggae and electronics musics – young solists recitals and contemporary music concerts.

Hi Amelie. The Festival de Radio France et Montpellier is a summer festival of opera and music held in Montpellier. The music festival concentrates on classical music and jazz with about 150 events, including opera, concerts, films, and talks. Most of these events are free and are held in the historic courtyards of the city or the modern concert halls of Le Corum. Le Corum cultural and conference centre contains 3 auditoriums. For more information go to: en.wikipedia.org/wiki/Montpellier