Of course like us sometimes opportunities come up at the last minute, but that doesn't mean she will forgo getting the bookings before hand. I have taken a provider on a mini trip we decided we both needed to get away for two days as friends. She would only go if she could get bookings from regulars so that she would not take a loss of income while we were away. So she put the word out got the bookings she needed we went away she took care of business and spent the next day just being tourists together. It was all spur of the moment but happened to work out.  The point being is even in a providers life sometimes opportunities come along that don't allow for a lot of advance notice but it is still worth it to post the ad and see if it will work out.