This answer my question. It seem that others Calendars offer that possibility. You do have a “start publishing” “Finish publishing” and a “Created Date” that can be use and I have now the confirmation that you can put future date in any of those fields without problems.
You should be able to use Article as Event, if your system permit it. Article are “Always the more flexible way to present any content. Adding that possibility to your system will be a plus.
Happy New Year