In a lot of families the kitchen is a place where everyone goes throughout the day. It is quite common to have a paper calendar in the kitchen with appts written on it, this allows you to do the same with a google calendar.

Of course, sharing the google calendar with everyone + having the app on their phones is probably better.

Calendars are a classic thing to stick to a fridge by magnets.

Magnets affect computing devices and are thus a violation of your terms of service and void your warranty...