All events created will provide the ticket buyer with a PDF ticket upon completion of booking by default.
For events that don't require a ticket to be presented for entry (eg. registrations, merchandise etc) or if you will be supplying hard tickets externally from the system, you are able to disable the PDF tickets from being issued.
To turn off tickets being issued:
From the left menu, click Dashboard
In the Manage events overview, select your event
From the left menu, go to Event publication, under Event promotion
Set Print Tickets to No
Click Save
With Print Tickets set to No, the ticket buyer will still receive a receipt and confirmation email upon completion of purchase. The confirmation email will confirm that tickets are not needed for the entry to the event.