Calendar upcoming location sensor

gistfile1.txt

- trigger:
  - platform: homeassistant
    event: start
  - platform: time_pattern
    hours: "/6"
  action:
  - service: calendar.list_events
    target:
      entity_id: calendar.personal
    data:
      duration:
        hours: 168
        minutes: 0
        seconds: 0
    response_variable: agenda
  - alias: Find upcoming events with locations
    variables:
      upcoming: "{{ agenda.events | rejectattr('location', 'undefined') | list }}"
  sensor:
    - name: Next Location
      state: >
        {% if upcoming|length > 0 %}
          {{ upcoming[0].location }}
        {% endif %}
    - name: Next Location Summary
      state: >
        {% if upcoming|length > 0 %}
          {{ upcoming[0].summary }}
        {% endif %}
    - name: Next Location Start
      state: >
        {% if upcoming|length > 0 %}
          {{ upcoming[0].start }}
        {% endif %}
      device_class: timestamp