see: https://docs.magicmirror.builders/getting-started/configuration.html#general

This is an example of how the config should be for multiple calendars. Expand as needed.

			module: "MMM-CalendarExt2", // https://github.com/MMM-CalendarExt2/MMM-CalendarExt2
			config: {
				calendars : [
					{
						url: "URL1",
						name: "Calendar 1", // Optional, Recommended
						// Other Options
					},
					{
						url: "URL2",
						name: "Calendar 2",
						// Other Options
					// etc
				],
				views: [
					{
						mode: // Pick Mode
						position: // Pick Position
						name: // Name Calendar Group 
						calendars: ["Calendar 1". "Calendar 2"],
						// other options
					},
					// OR, if you'd like the calendars independant from each other: 
					{
						mode: // Pick Mode
						position: // Pick Position
						name: // Name Calendar Group
						calendars: ["Calendar 1"],
						// Other Options
					},
					{
						mode: // Pick Mode
						position: // Pick Position
						name: // Name Calendar Group
						calendars: ["Calendar 2"],
						// Other Options
					},
				],
				scenes: [
					{
						name: "DEFAULT",
					},
				],
			},
		},