Many times, it is the sole source of income for a new club just starting, and planning their first show. Usually, tho, you can find one or two people in a club who excel at fundraising and are more than happy to take on the task.
Many shows require folks to prepare the food and handle a food concession at their shows.
You could contact clubs in your surrounding area and offer to feed their show, with the profit going to your club. Often, this will take a burden off the show management and they will be happy to have someone else take on this task - unless, of course, they're tied into using the food concession specified by the contract with their showhall. You could purchase booth space at a show, and have a bake sale. Be sure and check with clubs first to make sure that the selling of food from a sales table is acceptable to their showhall. Your club members could offer to help with this project, for a small fee.