Public parks often require a permit for catering to be done. For a last-minute affair, Julie Wadler, president of Epiphany Productions in Alexandria, Va. (epiphanyproductions.com), recommends filling up picnic baskets and delivering them to each department of a corporation in the morning, with a note that details where and when to meet for lunch. Everyone shows up, no advance planning required. Davina Kristi Brewer, owner of Atlanta-based 3Hats Communications (3hatscommunications.com), suggests hosting a potluck party. To get people interested in cooking, award prizes for the best dishes, and post the winning recipes on the company intranet.