We are going for May 5th to 10th and I think it is going to be very busy as Wednesday May 8th (Fête de la Victoire 1945) and Thursday May 9th (Ascension catholique) are public holidays and I imagine the French will faire le pont (literally, make the bridge, i.e. take a long weekend) and take Friday too to make a decent holiday of it. I expect these are holidays in other European countries too so I am anticipating mega crowds for us - you may be luckier going just before this kicks off!