Put a Dinger on it. It keeps dinging until someone taps Done.

Turn on the ding. Phones only allow sound after a tap. Keep Dinger open and it rings here.

New Dinger

Dings

Coming up

Voice announcements

Press and hold to record, let go to stop. Make a general one the default for every Dinger, and special ones like "Get Jimmy to soccer" for the times that need them.

Done

When a Dinger comes due it rings on every phone that has Dinger open, and it stops for everybody once someone taps Done. Snooze only quiets your own phone.