The ones I've never met before but need to see, I have to schedule the first to see. Back in school, I had learned scientific approaches to scheduling. Get the critical path out of the way, i.e. the hardest ones to schedule - the ones I most need to see but have the least time or flexibility to see me. Start with the day I'm leaving and work backwards. It's not just time that is of the essence.
Availability depends on time and distance.
This is the second dimension. One could use optimisation, I suppose. Minimise the time travelled between visits while maximising the number of people seen. Subject to my energy level. 20 August 2000 I had jotted down my thoughts of the day during my travels.