generally it is by changing modules/mod_jem/wide/tmpl/default.php for which template overrides could be used.
But unfortunately the data flieds provided by the model are mapped in modules/mod_jem/wide/helper.php so you have to enhance this file too (where overrides are not available so you need to do this again each time you update JEM).
In your specific case search in helper.php around line 142
So you can use $item->city, $item->zip and $item->street within the tmpl/default.php.
Same technique could be used on Banner or Teaser module too.
For other available fields take a look at components/com_jem/models/eventslist.php by checking "$query->select(..." lines in function getListQuery() - or set a breakpoint in helper.php and look at $row )
sorry for late answer but I don't get an email if a post is edited. I only got one triggered by your last, new post.
You're right, "descriptiontext" is theoretical corrrect but the line in helper.php is ... preihstoric.
Long time ago Joomla guys changed the introtext - fulltext handling so fulltext now will only contain the text behind the "read more" tag. If you don't have such a tag in your event description the complete description is stored in introtext.
So you can change "fulltext" to "inrotext" (in the line you quoted) to only get text before "read more" or use a line iike the following to always show the full description.
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