In the library we have had a google calendar for a few years set up to our library account so that all staff can access it and edit it. Last year for the cam23 things I set up a personal google account and then linked the two so that I can view and edit both (as long as I remember to add events to the right one!). The excerpt below shows this afternoon and the work calendar is pinkish and my calendar is green (showing my crime fiction book club meeting tonight).
It is great being able to access the calendar whatever computer I am on and also on my phone. It makes booking appointments much easier and I don’t have to go and fetch the diary. Of course if google calendar vanished I would be really stuck.