PARIS--So I've landed in fashion's beloved city, and I'm seeing Dries van Noten, Gareth Pugh, and Rochas later on today, but amidst the 90-plus shows are a gazillion good parties. Here's a sampling of what's on. If you're in town, these are what you don't want to miss: Roberto Cavalli's 40th Anniversary Gala Dinner and Party: Tonight The Cavalli maison is turning 40, and celebrating with a grand party at Ecole des Beaux-Arts. There will be "special performances," which we're betting will include Leonna Lewis and Taylor Swift, who both sat front row at the designer's Milan show. Vogue Paris' 90th Anniversary Gala: September 30 Carine's tome is turning 90, so expect this to be the best-looking party of the week. Oh, and it's a costume ball. So wear a mask.