For there to be a way to import events there would need to be a feature built for EE4 that allows for importing events. Right now that feature still a work in progress. You are invited to vote for and leave a comment on this feature request that’s being tracked on our Trello board:
The support post ‘EE4 Event import from CSV’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.