Dynamic dropdowns incl. multiple selections

Hi all,

I need your help with some VBA coding that I'm been struggling with over some time. I have created a workbook where you are able to select multiple or single weekdays and based on the input you should be able to choose that single day or days activities.

I have been able to solve the multiple selection but are having difficulties for the VBA code to accept the validation I have made. I have attached my test workbook as an example.

I really hope that someone is able to help or guide me as I have tried too long now without any break-through.

/Kasper