Moving targets

I'm trying to schedule activities for our vacation this weekend (long weekend in Lancaster). But no one is ever there when I first call, and each time I lock in something, something later down the chain messes it up. So now my carefully ordered schedule is a total mess - we're double-booked on two days, and have nothing to do on another. So I have to go back and start another round of phone calls to get things lined up again properly. I'm tired and frustrated, and I don't want to call everyone all over again. Why couldn't everyone just do what my schedule says? *pout*