Under the Etere Configuration module, in the Settings | Executive Editor | Schedule Parameters | Secondary Events as a default tab, it is possible to decide to activate secondary events automatically, either for all the commercials or events inside the schedule. It is also possible to decide to apply secondary events at each publish, to show secondary events conflicts and apply at each publish the transitions table as well.
Once enabled, assigned secondary events will be permanently associated to commercials and/or all events according to the rules set in this tab.
See chapter 59.2.40.16 Secondary Events as a default for more information.