As far as I know, when we use the present simple for future, generally it is used for public future schedules that we have no control over, such as, transportation schedules. So I don't understand why the tense can also be used for itineraries. Here are two samples in "Complete English as a Foreign":
A secretary is telling her boss his itinerary for a business trip next week: you arrive Endinburgh at 11.00. You have a lunch meeting with Mr Jone at 12.30 and then at 3.30 you take the train to Glasgow.
A travel agent's assistant is talking to his customer about his itinerary: you fly to Naples with Alitalia on the 12th of next month. When you get to Naples a coach picks you up form the airport and they drive you to your hotel. Next morning the coach takes you on excursion to...
For two samples above, I don't think they are public events and so unchangeable as ones in public transportation schedules. So I hope native speakers can tell me why the present simple can be used for itineraries and whether the present continuous and the present simple are exchangeable in the samples.