@Sinaca I converted your message into a

[marble quiver]

@tawdry dove your template says that you want Urlaub in the title, but your description says you don't.

Assuming that you meant what you put in the description then

     value_template: "{{ 'Urlaub' not in trigger.calendar_event.summary }}"

But #templates-archived can help with templates if you need more help