The list of PDWs in the registration system only reflects workshops which require additional registration above the Annual Meeting registration. If no registration is required, then the workshop is open to all attendees. If the description of the workshop(s) you are interested in (http://program.aomonline.org) indicates that registration is required, but it is not on our system, this could mean one of 2 things:
1. The organizer will be managing the registration process himself or herself. You will then need to contact him/her for more information on how to register.
2. The deadline for the workshop has passed, and is no longer open to accepting new registrations.