Hi Most likely those events have been duplicated somewhere whether that is in your personal calendar, the group's calendar, or another member's calendar. My recommendation is to remove the events that have had the issue and re-add them as new events. This should wipe out any 'extras' that may have populated between the new calendar update and today.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.