Star chef Giada De Laurentiis canceled her appearance at St. Anthony’s Feast in the North End because of Irene, but the Taste of Provincetown went on as scheduled. Chefs at the MassEquality benefit on Saturday night included former “Top Chef’’ contestant Tiffani Faison, who hosted a “QuickFire Challenge’’ with Frank Vasello of Relish, Laurence de Freitas of The Mews, and Michael Mishkin of Victor’s. The chefs had to make a sandwich using each other’s signature ingredients. Vasello won. The night raised about $85,000.