More than three years ago, I conceived of a pretty audacious vacation with friends and family to celebrate a big milestone in my life. Dr Marry and I are providing a fabulous opportunity for people to travel and stay in a big, beautiful house that we're renting as our gift to them. But they still have to get themselves there, pay for food and other accommodations beyond the house since it's just for three nights. While some people have decided, for various reasons, that they can't make the trip work, a number of people have enthusiastically said, "We're in!" Just because I plan something doesn't mean it will work for…