If you want to access all the certificates that will be handed out in the Event, you can create a report to get access to this information.
Go to Analyze > Certificates. A page containing all existing certificates will appear.
Select the certificate you wish to download. All available certificates will populate. Clicking on the Preview Link lets you examine the way they look prior to downloading and delivering them. 
On the top right, you should see an option that says Download Eligible Certificates. You will be sent an email that contains a download link to a .zip file containing .pdfs of all certificates from the selected session.
If you have any questions or need assistance, feel free to reach out to support team at support@boomset.com.