iOS users - Apple devices do not have this capability. You have two options. Set your iPhone/iPad to be silent while locked and not use your device during meetings, or manually set it to do not disturb during each meeting, or turn it off completely just like a flip phone. You may however add the church calendar to your device by pasting this address in your subscription list:
https://calendar.google.com/calendar/ical/6ku1s14biah8f2nvi4tb17l64g%40group.calendar.google.com/public/basic.ics