Google Calendar Any event starts. Android Device Mute ringtone.

When a meeting starts, automatically mute your Android ringtone

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This Applet monitors a Google Calendar you choose and every time a meeting on that calendar ends, your Android device's ringtone will be muted. Use this complimentary Applet to turn the ringtone back on after an event ends: https://ifttt.com/applets/ShzmBfSN