Play a homemade version of Jeopardy with questions and a playing board.
A poster board and post-it notes.
Divide the guests into two teams. Before the game make a "game board" with poster board and post-it notes. Write questions on a post-it note and then cover it with a second post-it note with the question amount ($200, $400 etc.) Have general cooking questions, questions about your company, questions from history, questions about music or just whatever you'd like to have talked about in your group. The game can be as long or as short as you'd like by adjusting the number of questions. Give the winning team party favors and the second place team lesser favors, but give something to everyone. It will be a huge success.