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A lot of what you're describing doesn't happen out-of-the-box, but I have used Calendar successfully in the past to plan out campaigns (and potential conflicts) by scheduling Smart Campaigns to act as date placeholders for various milestones. You just set a filler Smart Campaign with something like "if email address is your email address, run a one minute wait step on tentative date." That way nothing is affected but it's still in your calendar views.
If your instance is relatively new, I've noticed a bug with newer deployments where sometimes Events just...aren't there? Put in a ticket with Marketo Support and they'll bring the program type back in. You should have it in pretty much every package.
Overall though if you're looking to do more collaborative work in the Calendar, I'd recommend using a third-party tool in addition to Marketo's calendar: use Marketo for hard deadlines and something else for internal deadlines.
Thank you so much!