Thinking on your feet is one of your best skills, and it is one you haven't used in a while: luckily, you will get to use it today when some last-minute changes interrupt your carefully laid plans. This is going to be a little bit confusing, but it is also going to be a lot of fun! Any kind of stimulation, good or bad, will be enjoyable. The only thing that will make this day more enjoyable is if you can share it with someone you really care about: so call them up!