PRESENT CONTINUOUS WITH FUTURE MEANING:
The present continuous is used with future meaning to talk about fixed arrangements for events taking place in the near future. It usually implies that some preparation has already been made and the plan is definite. When the Present Continuous tense is used with a future meaning, an expression of future time is used to make clear that the meaning is future. Let's study these examples:
1) I'm meeting Jim at the airport tomorrow. = Jim and I have already discussed this.
2) I am leaving next week. = I've already bought my train ticket.
3) I am having a meeting with my students on Monday. = all the students have already been informed about it.