COD, or Conference Organizing Distribution, is an installation profile for Drupal, that makes it easy to create a conference website with features like event signup, session proposal, session voting/judging, session selection/scheduling, and social networking prior to events. Read more about COD's features on usecod.com and https://www.drupal.org/project/cod
For the latest information related to the process of porting this installation profile to D8, be sure to see https://www.drupal.org/node/2605232
For additional information about the D8 profile, including terminology we use, see https://github.com/drupal-cod/cod/blob/master/README.md
A group of conference sessions, assigned to locations and timeslots and days.