Hi @tonygao
Thanks for reaching out.
Unfortunately, the Event Tickets plugin does not have a feature that can send follow-up emails. Please see the available emails.
However, your desired use-case scenario may be possible with some custom coding, but if you decide to give that a try, please note we cannot provide full support for custom implementations like that.
Or you can also open a Support Ticket on our Help Desk and ask for assistance for an alternative solution to achieve the feature.
I hope this helps, and please let me know if you have further questions or concerns.