As it stands right now, you can use the batch message feature in Event Espresso 4 to send these out as a group, but they’ll need to be triggered manually. Also happening right now, the developers are working on an add-on that will add features for setting up automatic reminder and follow up emails. It’s basic functionality is outlined here:
The support post ‘Send reminder and follow-up messages to participants’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.