As a User of multiple projects in my organization, I would like the option to add an important date/task that effects all of the projects I have in my organization, so that I don't need to update every project with the same information (or ask all my PM's to do so)

As a scenario - we have 5 or 6 projects running at the same time that outline scrum schedules for 5 or 6 teams. Recently we decided to have a "developer day" - where all our developers, company wide, will step away from project work for a day to focus on engineering discipline. Since this effects all our projects I would love to add this task in one place, and have it appear on all our project timelines that are active. The result may mean that it causes issues for the PM's to mitigate, but I'm now confident that its accounted for in each of my teams project timelines.

A similar scenario may be a Marketing deadline that effects all teams, or a holiday that the office is closed on - or an upcoming team trip.