msg box to display if date expired

Hi,

I have a tracking system in excel where I've got a planned and an actual date for each stage in a project so each stage has to be done in order.

At several points in the project, meetings are set up accordingly: in the Second Tuesday of every 4 week period. So at the start of the project a provisional date is set up for each meeting.

I want a message box to display if the date is after that date like "Please review meeting date" , if that scheduled meeting has been missed.

Is there a way of doing this using VBA?

Please see attached sheet with more details.

Any help would be much appreciated

Many thanks
Harry