Last week at the Chicago Lightning Now Tour, a question came up around Calendar sharing. I just wanted to let you know that, at this time, you can only share your calendar (with your events); you cannot share custom calendars that you have created based on records on an object.

To share your calendar, go to the drop down next to My Calendar and select Share. From there, you determine how much detail other users can see about your events. Please note, though, that you can always see someone's calendar, regardless of whether he/she has shared it or not. If it has not been shared by that user, though, you will only see his/her events as blocks of time on the calendar.