Please note:
Some calendar applications, for instance the iOS calendar app as well as iCloud, do not always send an valid .ics file. Please be sure to cancel meetings from the original source of the calendar invite creation (e.g. Outlook or Google Calendar).
Recurring events that did not get cancelled:
If a meeting has been cancelled on the organizer's calendar and Amazon Chime continues to ring attendees, the organizer can use the Delete meeting series feature to cancel the meeting series. Please see https://answers.chime.aws/questions/666/how-do-i-cancel-a-recurring-amazon-chime-meeting-t.html for details.