To add reviews function to each event go to each event edit page and you should find "Review Event" box where you can enable reviews for that event.
Once this is done go to myEventON Settings > EventCard > Rearrange the order of eventCard event data boxes make sure Event Review Box is selected
Go to myEventon> Reviewer: in here you can enable email notifications when a new review get submitted.
Go to myEventon> Language: Under ADDON: EVENT REVIEWER You can customize the text for whichever language you are using eg. L1, L2.