MartinSmith1902, Try these two suggestions to see if the issue goes away. If not, let us know here. Thanks for your patience.
1. Remove that 'Meeting Room Calendar' (along with the 'TimeProfile' folder) and re-add it in Apple Calendar
2. Now if 'TimeProfile' folder reappears, delete it. The fix now allows the 'TimeProfile' folder to be deleted by user and that deletion will also persist.
HTH.