Watch a short tutorial:

Widget Connector

overlay	youtube
_template	com/atlassian/confluence/extra/widgetconnector/templates/youtube.vm
width	700px700
url	https://www.youtubevimeo.com/watch?v=96OWjVYTTgA&list=PL50JgGHM88Jw2FIrqomNCD5uvWzG7miuE&index=13&t=7s	height	350px795921128

Step-by-Step:

Modify Calendar

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