Dynamic calendar with table data allowing calendar to show events duration not just the start date

I have the below dynamic calendar that shows the start date of events in a table in a calendar format. 

I need to show the duration of the events, so when an event lasts three days it shows in the calendar across the relevant three days.

Can anyone assist in tweaking the below excel sheet to achieve this?

https://westminstergc-my.sharepoint.com/:x:/g/personal/piers_wre_london/Ed5YxeGOBLdMrzRT4EpG9NEBz-83Hpe3VDBRqW7WkjQEQw?e=yTOR4f