This extension is literally a duplicate from an existing one, what's the point of this if it already exists ?

Drag and Drop to Duplicate doesn't work...

This extension does not work, do not add it. There is another extension, Google Calendar Quick Duplicate by fabio.sangregorio.dev, that actually works which is what I currently use.

прекрасно! экономия действий, вот бы ещё горячие клавиши, но не понимаю, можно ли реализовать, как выделять события? наверное нет

Wow, pretty useful extension for google calendar copy event

A convenient and easy-to-use app, highly recommended for everyone. It helps quickly duplicate events in Google Calendar.