Double-click the .ics file in Finder, or drag it onto the Calendar app
Outlook
File → Open & Export → Import/Export → "Import an iCalendar file"
Event
Day—
Time—
Location—
Sport—
Clashes with
Possible swap
Your school has other team slots in this bracket that don't clash. Talk to a teammate if you'd rather swap — these are the alternatives the schedule still has free for you: