Topic: anyone know of any festivals in Paris?

im looking for a summer music festival in Paris.  orchestral or chamber music.
anyone know of any? 

last summer i went to Ameropa in Prague, CZ which was a rather relaxed two-week long chamber music festival that wasn't super competitive (and allowed time to sight-see) but was a great playing experience.  im hoping to try to find something similar in another city for this summer.