Outline any competitive advantages that you may have. Do you have any catering business qualifications or skills? Have you have experience in the hospitality industry? Do you have existing relationships with suppliers or prospective clients?
In a more broad sense, business planning helps businesses of all sizes to deal with the day-to-day needs of the organization by forcing the owner to weed through the operations of a typical work day. Business planning will assist you in understanding how to effectively market your business, how to understand and plan for financial stability both now and in the future, how to carry out your daily operations with a necessary level of routine, and so forth.
If your answer is no, you may have been able to easily accomplish this goal by planning for such expenses in advance through a business plan. Even if having cash at the ready is not a viable alternative for you, you may have planned to have a line of credit available for such opportunities, knowing that in your field these opportunities do arise from time to time.
In essence, here is a great way to think of superior business planning. Imagine you are taking a road trip from California to New York. No planning ("flying by the seat of your pants") would involve you getting in the car and driving "East" on every freeway you come across. Adequate planning would involve mapping out your course, planning where to stay overnight, where to eat, sights to see, and so forth.