Copy a link
Open the event and go to the sharing options.
Select Direct Calendar Links.
Select the copy button next to the calendar you want.
The links
Every link follows the same pattern, with your event's code and the calendar at the end:
Google: google
Apple: apple
Yahoo: yahoo
Office 365: office365
Outlook (online): outlook
Outlook (desktop): outlook_offline
Microsoft Teams: teams
iCal file: ical
The event code is the last part of the event page link: for https://calendarlink.com/event/c42b9, it is c42b9.
What is in the iCal file
The ical link downloads a calendar file that works in most calendar apps. It contains:
the title, description, location and status;
the start and end time in UTC, which the calendar app converts to the reader's timezone;
the reminder from the event form, such as 30 minutes before.
The file has no organizer, so the calendar app decides what it shows in that place.
After you change the event
People who already added the event keep the version they saved. A change does not reach their calendar, unless they subscribed to the collection. See What happens when you change a shared event.