What will take place on Monday?

W:(47)I’ve been busy preparing for the monthly meeting on Monday. All of the regional managers are going to be there.
M: So, that is why you have been working so hard. Do you need any help with anything?
W: Yes, I would appreciate that.(48)Can you call my assistant and ask him to remind the regional managers of the meeting schedule?
M: Sure. No problem at all.(49)What is his number?