Import Excel Spreadsheet Issue SharePoint Online

I've exported a list of events from an SharePoint 2007 calendar.  I then imported them to a SharePoint Online list and created a calendar view.   The import worked fine and it looks fine.  However, I don't have the capability to add new items by clicking anywhere - not even within the date square on a calendar.  It does not offer the "add" option.  I don't know what other limitations I may run into.  

Is there another way to get Excel data into a SharePoint Online calendar with the full functionality of the calendar or Events app? 

 

Thank you.