On everyone's phones and on a screen in the kitchen. Add something once and everyone knows — no reminding, no "you never told me".
Two minutes. You'll be adding things to the calendar straight after.
Shows at the top of the wall display. You can change it later.
Sign in and everything's where you left it.
Everyone who'll show up on the calendar. Kids included, and they don't need accounts.
Your family's calendar is ready.