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If you have selected a client for the event, they are also emailed a thankyou note, and given the opportunity to leave feedback for you to review at your leisure. These client emails can be disabled by editing the client details and setting 'Send post-event feedback requests' to 'No'. This feedback is then forwarded to any staff specified in the 'Post-event information recipients' area within the 'Site configuration' page.
Emails to clients and your staff are sent the next day after the event concludes.