Technically I work from home, but I do have an office on a school campus as well. That is where I will meet up with my students. Many ed. therapists will have the students come to them at their home. I don't.
Anyway, if I don't go in for the therapy session, it doesn't get done. I just let them know ahead of time if I will be away for any reason. I don't have anyone else to fill in.