You can use Report menu in Modern Events Calendar to view all the participants of your events.
Modern Events Calendar Report Options
Report feature was added since version 5.0.0. To send an email to your attendees and/or view a list of them, you can use this menu.
First select the event name, and then select the date. Select all or some of the participants and the click on the button to send email.
Finally, write the content of the email and send it with just one click.
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