I had the same question and just figured it out largely by accident. Go into your Calendar, select the “Meetings” tab (as opposed to Day or Week or Month). This will list all your meetings. Then you can select each meeting by clicking a few columns to the left of Meeting Time. I don’t know what this column is, but you know it’s correct if you see a black checkmark after clicking. You can single click as many entries as you like, or you can drag the mouse selecting many entries quickly. Then hit the delete key.
It will burp on the operation if you have selected any repeating meetings so uncheck those. You have to expand those and delete the single instance, at which point they will ask if you want to delete all instances.