I was able to get it working. For those that may need to resolve this in the future, the answer was at this link:

https://github.com/MMRIZE/MMM-CalendarExt3Agenda#update-to-120

When some submodule is not updated, try this.

cd ~/MagicMirror/modules/MMM-CalendarExt3Agenda
git submodule update --init --recursive

I was able to get MMM-CalendarExt3 working, but I’m struggling with MMM-CalendarExt3Agenda. I cannot figure out what I’m doing wrong. None of the events appear in the MMM-CalendarExt3Agenda module but they do appear in the MMM-CalendarExt3 module. Any help is appreciated.

Google Calendar Config

{
	module: "MMM-GoogleCalendar",
	header: "Family Calendar",
	classes: "calendar-agenda",
	config: {
		calendars: [
			{
				symbol: "calendar-week",
				calendarID: "myemail@gmail.com",
				name: "mycalendar"
			},
		],
		broadcastEvents: true,
		broadcastPstEvents: true,
		maximumEntries: 100
	}
},

MMM-CalendarExt3 Config

{
	module: "MMM-CalendarExt3",
	position: "top_center",
	title: "Family Calendar EXT3",
	config: {
		mode: "month",
		instanceID: "Ext-Calendar-Month",
		calendarSet: ['mycalendar'],
		weeksInView: 3,
		preProcessor: (e) => {
			if (e.start?.dateTime) {
				  e.startDate = new Date(e.start.dateTime).valueOf()
			} else if (e.start?.date) {
				  e.startDate = new Date('${e.start.date}T00:00:00').valueOf()
			}

			if (e.end?.dateTime) {
				  e.endDate = new Date(e.end.dateTime).valueOf()
			} else if (e.end?.date) {
				  e.endDate = new Date('${e.end.date}T00:00:00').valueOf()
			}

			e.title = e.summary
			e.fullDayEvent = (e.start?.date) ? true : false
			return e
		}
	}
},

MMM-CalendarExt3Agenda Config

{
	module: "MMM-CalendarExt3Agenda",
	position: "top_left",
	title: "Something",
	config: {
		instanceId: "Ext3-Calendar-Agenda",
		calendarSet: ['mycalendar'],
		firstDayOfWeek: 1,
		startDayIndex: -1,
		endDayIndex: 10,
		showMiniMonthCalendar: false,
		preProcessor: (e) => {
			if (e.start?.dateTime) {
				  e.startDate = new Date(e.start.dateTime).valueOf()
			} else if (e.start?.date) {
				  e.startDate = new Date('${e.start.date}T00:00:00').valueOf()
			}

			if (e.end?.dateTime) {
				  e.endDate = new Date(e.end.dateTime).valueOf()
			} else if (e.end?.date) {
				  e.endDate = new Date('${e.end.date}T00:00:00').valueOf()
			}

			e.title = e.summary
			e.fullDayEvent = (e.start?.date) ? true : false
			return e
		}
	}
},

@BKeyport In addition to that code you sent, I also had to add “broadcastEvents: true” to the MMM-GoogleCalendar config. Now I’m able to see events on the MMM-CalendarEXT3 module. Thanks!

@BKeyport I appreciate the quick reply. I tried adding that but unfortunately it didn’t change anything.

Is there anything I need to do with eventNotification?

{
	module: "MMM-GoogleCalendar",
	header: "Family Calendar",
	position: "top_left",
	classes: "calendar-agenda",
	config: {
		calendars: [
			{
				symbol: "calendar-week",
				calendarID: "myemail@gmail.com",
				name: "mycalendar"
			},
		],
		fade: false,
		maximumNumberOfDays: 5,
		showlocation: true,
		tableClass: "medium",
		
	}
},
{
	module: "MMM-CalendarExt3",
	position: "top_left",
	title: "Family Calendar EXT3",
	config: {
		mode: "week",
		instanceID: "I-calendar-month",
		calendarSet: ['mycalendar'],
		weeksInView: 3,
		preProcessor: (e) => {
			if (e.start?.dateTime) {
				  e.startDate = new Date(e.start.dateTime).valueOf()
			} else if (e.start?.date) {
				  e.startDate = new Date(`${e.start.date}T00:00:00`).valueOf()
			}

			if (e.end?.dateTime) {
				  e.endDate = new Date(e.end.dateTime).valueOf()
			} else if (e.end?.date) {
				  e.endDate = new Date(`${e.end.date}T00:00:00`).valueOf()
			}

			e.title = e.summary
			e.fullDayEvent = (e.start?.date) ? true : false
			return e
		}
	}
},

How do I use MMM-CalendarExt3 to show events from MMM-GoogleCalendar? I have MMM-GoogleCalendar setup and it’s displaying events. However, I tried adding MMM-CalendarExt3 to the config and it won’t display anything. Any help is much appreciated.

My config file…

{
	module: "MMM-GoogleCalendar",
	header: "Family Calendar",
	position: "top_left",
	classes: "calendar-agenda",
	config: {
		calendars: [
			{
				symbol: "calendar-week",
				calendarID: "myemail@gmail.com",
				name: "mycalendar"
			},
		],
		fade: false,
		maximumNumberOfDays: 5,
		showlocation: true,
		tableClass: "medium",
		
	}
},
{
	module: "MMM-CalendarExt3",
	position: "top_left",
	config: {
		instanceID: "I-calendar-month",
		calendarSet: ['mycalendar'],
		weeksInView: 3
	}
},