Reservations Automatic notification on reservation status change - sign, cancel, move in queue, reminder before event. Notification settings can be change based on customer and event.
Event promotion You have regular event that does reach optimal number of participants? You can configure automatic promotion of the event. It is subtle and send only to those who would be interested in the event.
Expiring subscription reminder Simple reminder for expiring subscription could do wonders and shorten the time between subscription renews which would directly increase your revenue.
Transactional emails On every purchase made on reception or online, the customer will receive email and generate invoice with a single click.