Thanks for your answer Franky.
I have a bit of testing.
I have a few new templates created => template / creat new
I’m using a short code, under settings / event / single event format
The short code determined from the category the appropriate template.
If I keep showing the event, the appropriate template is displayed.
This is good, but all the placeholder does not work.

Do you have any idea?

Hallo Franky,

at the moment I am testing only in the test installation.
Here is the link to the results:

For the shortcode I use this:

 function eme_fj_single_event_format_nach_kategorie($atts) {
    /*  angegeben werden muß die ID der Vorlage/Template für das entsprechende Ereigniss */
    $template_ohne_cat = 10;            // ID für Events ohne Kategorie
    $template_multiple_cats = 11;       // ID für Events mit mehr als einer Kategorie
    $template_standard = 12;            // standard Layout, wenn für die gewählte Kategorie kein spezielles Template vorh. ist
    $template_slalomregatta = 13;        // Template Slalomregatta

    extract ( shortcode_atts ( array ('id'=>0), $atts));

    $event=eme_get_event($id);
    $txt_categories=$event[event_category_ids];

    if ($txt_categories =="") {                                     // abprüfen ob eine Kategorie ausgewählt wurde
        $template = eme_get_template($template_ohne_cat);
        return  ($template[format]);                    // Aufruf Template mit Hinweise keine Kategorie ausgewählt
    }else {
        $category_ids= explode(',', $txt_categories);
        $anzahl_cat= count($category_ids);
    }
    if ($anzahl_cat >1) {
        $template = eme_get_template($template_multiple_cats);
        return  ($template[format]);           // Aufruf Template mit Hinweise: es wurden mehrere Kategorie ausgewählt
    }else {
        switch ($category_ids[0]) {
            case "8":
                $template = eme_get_template($template_slalomregatta);
                return  ($template[format]);
                break;
            default:
                $template = eme_get_template($template_standard);
                return  ($template[format]);
        }
    }
 }
 add_shortcode ('eme_fj_Vorlage_nach_Kategorie', 'eme_fj_single_event_format_nach_kategorie');

I appears unable not insert a link

http://testinstallation.lkc-lueneburg.de/termine/445/test-event/

Thank’s, now it worked!
Great plugin, very flexible and great support.
But that was only the first part of the work.
It is possible to implement the same with the RSVP and the emails.

Ok it works!
For normal user, I think is too complicated.
The ability to make errors is relatively large.

1. The table of templates requires an additional field.
We now have many different templates in the table.
Templates for:
-Event lists, body, header, footer
-single event format
-single event RSVP mails, with different custom fields
-single event registration form, with different custom fields
With a new field, you can differentiate which kind of template it is.
When creating an event the contents of the dropdown list can be adjusted accordingly.

2. New table for templates combinations.
Complete format for events consisting of:
-single event format
-single event RSVP mails
-single event registration form

3. New dropdown field in the event creating form to select the compl. format
=> the normal user has no chance to make a mistake.

Nice to have:
Create an event, select an event template:
1. In the drop list of custom attributes are displayed only the custom attributes used in the selected template.
2. A new form of custom attributes, similar to the custom fields. A dropdown list with pre-fixed contents.

Please look again, Dashboard, Templates, Listview
The list is order by the creation date, perhaps it is better to order them according to the description.

Many ideas, I hope you do not kill me!

Have a nice day