Collection of graph

foreach .Event
{  'Event: ' id newline
   do :scenes
   {  '   Scene graph: ' id newline
      foreach .()
      {  '      ' id ': ' type newline
      }    
   }
}

Better style is to refactor the parts inside Scene Design into a new generator, which you write in the Scene Design graph type. The top-level generator thus has:

foreach .Event {  'Event: ' id newline    do :scenes    {  _Contents()    } }

and in a new Generator Editor in Scene Design:

_Contents()
'Scene graph: ' id newline
foreach .()
{  '      ' id ': ' type newline
}

It's important to save generators in the right graph type. When calling a sub-generator, it is looked up in the generators of the current graph's type. The current graph changes when you navigate into a different graph, as you do here inside do :scenes {_Contents()}. The sub-generator _Contents() will thus be looked up in the generators of the Scene Design graph type.