Delete or hide a calendar event on iCloud.com

Go to icloud.com/calendar, sign in to your Apple Account (if necessary), then do any of the following:

Delete an event you own: Double-click the event to select it, then click Delete.

If you invited anyone to the event or if it belongs to a shared calendar, participants are notified of the cancellation.
If the event is a recurring one, an alert appears giving you the option to delete only this event or all future occurrences of the event.
Delete an event you’re invited to: Double-click the event to select it, then decline the event.
Set Calendar to automatically hide past events: Click at the top of the sidebar, then choose Settings. Click Events, select “Hide events [x] days after theyʼve passed,” then enter the number of days. Click .
To show hidden events, deselect the same option.

If you accidentally delete a calendar or event stored in iCloud, you can restore an archived version of your calendars. See Restore your calendars and events on iCloud.com.

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iCloud User Guide