I woke this morning to a private message asking if I knew the 2024 Fashion Week dates so the writer could avoid them. Up until now, I and others on this Forum, have told people that September is expensive and crowded due to trade fairs and Fashion Week and to look to October.
Still true that September is busy, but after a quick 5-day visit to Paris mid-October, I saw astonishing crowds this year, some museum waits the longest I have ever seen in my frequent visits over many decades. So, I'm changing my advice to: go any time hotels and prices are accessible to you, but plan your days very carefully to avoid the worst of the crush.
What is your opinion on September vs October or July, August, etc?
How do you plan so you don't find yourself at the end of a long line even with timed reservations?