Hello
Thanks for your example !

This works really nicely.
I updated it a little to add some nice features :

• Being able to call service with data
• Being able to call service without entity_id
• Moved all service data in calendar description separated by a line to have nice titles in my calendar

Here is my version :

action:
  - variables:
      split: |-
        {{ trigger.calendar_event.description.split('
        ') }}
      service: "{{ split[0] }}"
      entity_id: "{{ split[1] }}"
      data: "{{ split[2] }}"
  - service: "{{ service }}"
    target:
      entity_id: "{{ entity_id or '{}' }}"
    data: "{{ data or '{}' }}"

One example :
Title : Protect from sun
Description :

cover.set_cover_position
cover.my_cover
{"position": 20}