With all those cold dark weekends that Paris has during the year, and they couldn't find any better time to schedule this than in summer, and specifically on the Solidays weekend. Boooo!
That was a very tough call we had to make by choosing this date. We kept it in order to respect the tradition. Who would we be if we break the rules on the third event :P
Yeah, I'm just complaining because - well, because that's what you do when you live in Paris :D Still, it might be an idea to start slowly moving the date earlier in the year - April has far worse weather and shorter days than June, so it is far better suited to indoors activities ;)