Here is my config- I have replaced the calendar urls under as I dont want to show them to the world.

modules: [
		{
			module: 'MMM-Remote-Control',
			// uncomment the following line to show the URL of the remote control on the mirror
			// position: 'bottom_left',
			// you can hide this module afterwards from the remote control itself
			config: {
            apiKey: 'c92e9765778gh56h83f66fffd333c6a5'
			}
		},
		{
			module: "alert",
		},
		{
			module: 'MMM-YrThen',
			position: 'top_left',
			config: {
				location: '1-107159',
				showAll: "false",
				details: "false",
				title: "Været på Frekhaug neste uke",
				header: "true",
				size: "medium",
				windGust: "true",
				windUnit: "m/s",
			}
		},
		{
			module: "clock",
			position: "top_right",
			config: {
			dateFormat: "dddd, D. MMMM YYYY",
			showSunTimes: "true",
			lat: "60.520806",
			lon: "5.237736",
			},
		},
		{
			module: 'MMM-YrNow',
			position: 'top_right',
			config: {
				locationId: '1-107159',
				showWeatherForecast: true
			}
		},
		{
			module: "calendar",
			position: "top_left",
			hiddenOnStartup: "true",
			config: {
				broadcastPastEvents: true, // <= IMPORTANT to see past events
				calendars: [
					{
						symbol: "none",
						url: "Google Calendar url",
						color: "#8BD3E6", //Blå
						name: "Øyvind",
					},
					{
						symbol: "none",
						url: "Google Calendar url",
						color: "#800080", //Lilla
						name: "Solvor",
					},
					{
						symbol: "none",
						url: "Google Calendar url",
						color: "#FF6D6A", //Rød
						name: "Håkon",
					},
					{
						symbol: "none",
						url: "hGoogle Calendar url",
						color: "#E9EC6B", //Gul
						name: "Marius",
					},
					{
						symbol: "none",
						url: "Google Calendar url",
						color: "#77DD77", //Grønn
						name: "Sverre",
					},
					{
						symbol: "none",
						url: "Google Calendar url",
						color: "#fffff", //Hvit
						name: "Helligdager",
					},
					
				]
			},
		},
		{
			module: 'MMM-GoogleCalendar',
			position: "top_left",
			hiddenOnStartup: "true",
			config: {
				calendars: [
					{
					symbol: "none",
					calendarID: "Google Calendar id"
					color: "#000000", //Svart
					name: "Familie",
					},
					],
			}
		},	
		{
			module: "MMM-CalendarExt3",
			position: "bottom_bar",
			title: "",
			config: {
				mode: "week",
				weekIndex: "0",
				weeksInView: "4",
				instanceId: "basicCalendar",
				locale: 'nb',
				maxEventLines: 10,
				firstDayOfWeek: 1,
				calendarSet: [],
				eventHeight: "22px",
				displayLegend: "true",
				eventTransformer: (e) => {
					e.startDate = new Date(e.start?.date || e.start?.dateTime).valueOf()
					e.endDate = new Date(e.end?.date || e.end?.dateTime).valueOf()
					e.title = e.summary
					e.fulldayEvent = (e.start?.date) ? true : false
					return e
					}
			}
		},
		 

	]