a screenshot from Pubmed without words
probably as good as an email that I received recently:
This is the final reminder of your registration.
THE ABOVE BARCODE CONTAINS YOUR BADGE AND TICKET INFORMATION!
Please be sure to PRINT out this e-mail and BRING it with you to the meeting. The barcode included on this reminder will speed you through the registration and materials pick-up area.
Please consider the environment before printing this email.