These are blueprints for occasions of the casual variety—the ones that are popular this time of year for requiring the presence of many friends and little in the go-all-out department. Don’t worry, we’ll get the fancy affairs taken care of in good time, but for now, feel free to match your lip balm to your apron, bring your new goop nontoxic cookware to the table, and wear your sweats—albeit your dressy sweats—to dinner.