Decide on a communication platform with which everyone can be comfortable and explain how you will communicate to them en masse (via email, text, Google Drive sharing, or otherwise). Try to keep your communications effective by being consistently substantive, positive and as few as needed (but no fewer). Try to schedule the meetings and circulate the agenda with any preparatory materials to be reviewed as soon as practicable to your TAs. Remember, they have personal and professional lives in addition to your PAB, so make it as easy for them as possible to help you. You can try a tool like Doodle.com to schedule your meetings.
It's important for everyone to be empowering you, not just pointing out your faults. If anyone has something negative to say, ask them to re-cast the statement in the form of a question. If it does have to be stated, guide board advisers to use constructive criticism only (that is, no complaining or whining; have a solution ready to propose to the problem they are observing). If a board adviser has a problem with another and would like to address it but is not sure how, please encourage them to bring it to your attention confidentially so that it can be determined the best way toward a productive outcome. Public, positive discussions and praise are wholeheartedly welcomed and encouraged. Praise publicly, and often!