Update Sept. 3, 2017 This notice from the EIC tells us no further tickets are available but one can send comments electronically:
Thank you for contacting the Presidential Advisory Commission on Election Integrity. We have reached maximum capacity for the September 12, 2017 public meeting and are no longer accepting registrations. The meeting will be broadcast online through livestream. Instructions for accessing the livestream will be published soon on https://www.whitehouse.gov/blog/2017/07/13/presidential-advisory-commission-election-integrity.
Click on this link for an article on Sec. of State Gardner's participation in the Commission. (8/30/17 article)