3. To configure the sidebar go to https://radar.squat.net/events and filter for the events you want to show. Maybe your city and group, or a category etc.
4. Once you have the events filter you want copy the address from your address bar into the widget.
If you put the shortcode in a page called 'Events', make sure you've disabled any plugins which would suppress the contents of that page, for example 'The Events Calendar'.
For extra-easy instructions with screenshots, look here: