Creating a Corporate Calendar my staff can view and edit?

I thought this would be simple ... but perhaps not.

Any advice on how I can easily set up a Corporate Calendar for my company for key company dates, staff leave etc so we can all be on the same page.

At the moment all I can see as an option is sharing one persons calendar which doesnt seem right.  I also want it to work accross platforms - laptops, mobile devices etc.

Appreciate any advice in pointing me in the right direction

Cheers

Scott