Let's try this. If you either post in this thread or click on the FOLLOW button I believe this messaging system will send you an email when someone posts.
If you plan to ride a certain time and want some company, post the time you will be online here. If it goes as planned the system will notify all the followers of this thread with an email with your scheduled ride time so they can join in if they choose.
If any of the Zwift staff has a better option for getting something like this going please feel free to jump in!