If you change a plan, especially at the last minute, you need to take responsibility for the increased workload that you've made for everyone. This principle holds true even when you suddenly decide to cancel a catering service because you'd rather cook for 20 people yourself. If you have the ability and time and would like to take on that task, more power to you, but don't expect others to give up their time and energy to help out when they were quite happy with the original option in the firs…