Maisonette.com, the premier online destination for luxury childrenswear and home décor, celebrated the opening of its first-ever pop-up retail store in the Hamptons with an intimate dinner party hosted by site Co-Founders Sylvana Durrett and Luisana Mendoza de Roccia. The shop, dubbed Maisonette Market, is open at Theory East Hampton from August 18-27, and features a week-long calendar of family-fun events. Notable dinner guests included Jessica Seinfeld, Tabitha Simmons, Lizzie Tisch, David Burtka, Erin Walsh, Marcus Wainwright & Glenna Neece, Candice Miller, Gucci Westman, Christina Di Donna and Casey Fremont.