Each time when a ticket is sold, an email is being sent to the email address defined within Tickera Settings -> Email tab -> Admin Order Completed Email area and Admin Order Placed Email area (depending on whether you want to send emails to admins when order is placed or completed or in both cases). Now, although you can enter multiple, comma separated email addresses to the To Email address field, there is no possibility to differentiate these emails so that emails are sent to the event organizers only for their events.
To achieve this, however, you will have to completely change the approach and run Tickera in WordPress multisite network. That way, you can dedicate a subsite to each of the event organizers where they can create and manage only their events and tickets and have emails being sent to event organizers only for their events.