Calendar - multiple functions on one calendar

We have a couple of specific use cases for this. One is to see Release dates from our product workspaces alongside key Activity Due Dates from some of our more project management oriented teams/workspaces. Each workspace is using a data model that makes their work sensible and efficient. To artificially introduce a "fake card" in the release, to show next to the project Activities, is a bad solution. To force the project teams to artificially create entire Plans (Releases) for work that is naturally sized as an Activity, makes a mess of their board.
The other interesting use case would be a personal calendar, where a user could see their activities and to do's on the same calendar.
I realize this request is a completely different approach to reporting than exists anywhere in Aha (that I can think of) - as we are asking that rather than starting from a record type, we actually want to start from the display or container, and then associate the report elements (the "date" and the "text to show on that date") to various data records which could be anywhere in the Aha data model and subject to any filterable condition. For instance: for Releases in Workspace A, display [Release name] on [Release date]; AND, for Activities of Type "Maintenance" in Workspace B, display [Activity name] on [Activity due date]; AND, for Plans in Workspace C, display [Plan name] on [Complete by date].

I am an Enterprise Release Manager and I manage releases and activities across many teams, the ability to have a singular calendar with various types of elements on it would be incredibly helpful for planning releases and managing various workspaces with different configurations. Adding multiple calendars to dashboards is not an effective use of the already tight space.

It is necessary to view multiple calendar together (activities due date and to-do due date) then I can have a beter plan of my schedule. I am suprised I can't do it on Aha...

I'm surprised it isn't already available. It would be great to have this added. 

Adding to the sentiment that this would be a most helpful feature being able to see features and master features on a single calendar view.

Yes, for us that is the most wanted feature. We want to work from one central calendar for all work, so it should be great to see todo's and features on the same calendar (optional via calendar settings).