Change Calendar Publish

We want to publish the Change Calendar for all people in the organization via Outlook or Sharepoint or any other platform where we can see the changes for last 3 months and the changes for the upcoming 3 months.

How can this be done without needing any new licenses using API integration of some sort ??
I tried the Office 365 app available on marketplace but the app shows change calendar only to the agent who is working on the change and not to everyone.