Using Notification Per Event feature in Modern Events Calendar you can customize your notifications per each event on the event settings.
Modern Events Calendar Notifications Per Event Options
What you need to do is to go to MEC Settings > Notifications > Notifications Per Event and check the “Edit Notifications Per Event” option.
Then you need to go to Single Event Edit Page > Event Details > Notification and check the “Modify” option under the any of the notification that you want to manually customize for that event.
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