Hi Mary-Anne,
Great question! I’m afraid that none of our plugins directly integrate with MailChimp.
That said, it’s definitely possible to download the Attendee list, which is CSV format:

You can use the downloaded CSV file to import into MailChimp and create a list of email subscribers for that particular event — or combine it with the CSV files from other events to create a master list of attendees from all events.
Does this help answer your question? Please let me know.
Cheers!
Geoff