Change single event template – Please help!

Here is the problem:

The sidebar om the single event page here is wrong: https://d26596123.u48.surftown.dk/kalender/comfort-in-living/#.UWVlllePZrk

It has to be this sidebar used on the page displaying the calendar
https://d26596123.u48.surftown.dk/kalender-4/

The thing is, that the single event page is using my themes post template and the calendar page is using the left-sidebar template.

I get the picture, but my php skills are poor and I don′t know what templates to combine, to get the right result.

And yes I have read: https://wp-event-organiser.com/documentation/editing-the-templates/

So please, if you can, help.

Cool Plugin!

https://www.ads-software.com/extend/plugins/event-organiser/