This extension might be useful for those who use https://calendar.google.com.
On an event's editing page, it adds button to event title's input to mark event as completed by applying strikethrough effect over event's title.
After that you can see in your calendar the event is completed.
Changelog
1.1.0 - 10/04/2020:
- add check emoji in the beginning (configurable in options)
- fix issue for event titles with emojis
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