Invite some of your good friends over for a casual dinner. Upon their arrival, pair them up and give each couple an envelope with some money and their assignment (i.e. "buy the ingredients for a dessert, then come back and prepare it.") You might assign appetizers to everyone, taco fixings or menu categories (vegetables, salad, rolls, dessert or even beverages). The hostess would prepare the main course.
Half the fun will be getting the meal together and having fun in the kitchen coming up with a creative menu to serve. This idea is derived from "Home is Where the Heart is" (Daysbrings by Garborg's, Inc.)
I thought of an idea to go along with this idea, have one person purchase some flowers for the table and create a pretty centerpiece for the table.