There might be technical reasons why this isn't easy / quick fix... but I notice that on the event listing, only the start date is shown in the visual 'graphic'
There seems to be space to include, where it's more than a one day event, the close date too... can you take a look at the attached to see what I mean...
Left Image: How it currently is
Middle Image: How it could show start/end dates in same month
Right Image: How it could show start/end dates in different months
Thanks for conisdering