First, access the option menu Marketing.
Now go to the Mailchimp, where is indicated in the image.
Now you need to generate your token on the https://mailchimp.com and insert it in the indicated field.
Now just set up it, selecting the list of participants, choosing the export options and choosing the ticket categories. To finish, click on the Exportar.
Your list of participants will now be available on your Mailchimp email list :)