Calendar Availability Settings when using Outlook on Mac

Hello team,

Looking for some help with calendar settings when using Outlook. I created a sports property calendar, and for users utilizing Outlook on Mac it is showing their meeting availability as busy during the day of a sport event.

The event’s aren’t timed and appear as headers in Outlook - does anyone know how to set the default settings to not show as busy during these events without manually setting each topic as available?

Any help would be greatly appreciated!

Thanks,
Harry