Can't delete event

Here is an interesting v1 calendar issue.

Several stakes in our area were recently reorganized. Two wards from our stake were moved to a different stake. The previous stake building scheduler lived in one of those wards. I was called to replace him. Prior to moving stakes, he created a reoccurring cub den meeting event in our stake resource calendar for one of the wards that left. It wasn't created on the ward calendar, it was on a building calendar that we maintain at the stake level. Long story about how the event ended up there, but it is there nonetheless.

Since they that ward is meeting in a different building, I decided to remove the event so it would free up the building/room that is currently schedule. When I attempt to open the event up, I receive the following message:
After I hit "ok", the event never populates the blank event form.

Any ideas on how I should free this up?

Unless someone has a better idea, a call to Local Unit Support is probably the best answer.