Hmm.. there was a dropdown in 3.7 where i could choose a layout. Specially for a such purpose. And also a dropdown for a style (skeleton, etc.). Now the both dropdowns are gone. Or do I miss something?
ok, so I can change the content rendering. But, how can I add a sidebar? What I mead – the whole page template (contend width, default sidebar) , not only a content layout for a single event.