Hi John!
Thanks for your interest in our plugins!
We apologize for a bit of delay in getting back to you. We are dealing with a high volume of threads at the moment and we are slowly getting back to normal response times.
Our Event Tickets and Event Tickets Plus plugins send a ticket email to the user once they purchase a ticket or RSVP for an event.
However, there is no built-in functionality to do email follow ups nor we directly integrate with Mailchimp. I know some users make use of third party plugins to achieve this sort of functionality.
Let me share the following article that gives a good overview of how to get started with Event Tickets and Event Tickets Plus > https://theeventscalendar.com/knowledgebase/new-user-primer-event-tickets/
I hope that helps. Let me know if any follow up questions 🙂
Best,
Victor