Anyone (including non-AIA members) can set up an AIA account (use this link: https://account.aia.org/signup).
Once that profile is created, people can follow and participate in any Knowledge Community (such as COTE) on Knowledge Net (KNet).
To engage with KCs, start here https://network.aia.org/home and click Join Now ...
That should take you here https://me.aia.org/s/interests.
Those who select/follow the COTE Knowledge Community will automatically receive the COTE newsletter (delivered to the email at which they signed up); it comes out six times a year, in January, March, May, July, September, and November. Questions or concerns? Let us know at cote@aia.org.