How do transfer Google Calendar ‘all day’ events from one month to the other?

I put my tasks on my calendar as ‘all-day’ events (there is Google Tasks for Calendar but I don’t want to use it). However, since August ended with a Saturday, there is not a single day of September displayed on the month view of August, so I can’t drag-and-drop my events from August to September. I don’t want to click and go to the edit view of every single August event/task and change the date to September.

Is there a faster way?