Binary Sensor referencing today's calendar events

Configuration
1

How do I write a template for a new binary sensor that simply checks whether a specific event name is on the calendar for today, and then sets true/false?

This works:

service: calendar.list_events
data:
  start_date_time: "{{ today_at() }}"
  end_date_time: "{{ today_at('23:59:59') }}"
target:
  entity_id: calendar.dpw
response_variable: agenda

This does not work:

# Binary Sensors
binary_sensor:
  - platform: template
    sensors:
      test:
        friendly_name: 'my_test'
        value_template:
          {% set agenda_list = agenda.events %}
          {% if 'string' in agenda_list %}
            True
          {% else %}
            False
          {% endif %}
2

Automation to update daily

alias: Calendar 1-Day Agenda to Event
trigger:
  - platform: time
    at: "00:01:00"
condition: []
action:
  - service: calendar.list_events
    data:
      start_date_time: "{{ today_at() }}"
      end_date_time: "{{ today_at('23:59:59') }}"
    target:
      entity_id: calendar.my_calendar
    response_variable: agenda
  - event: custom_calendar_agenda
    event_data:
      calendar: my_calendar
      cal_events: "{{ agenda }}"
mode: single

Template binary sensor:

template:
  - trigger:
      - platform: event
        event_type: custom_calendar_agenda
        event_data:
          calendar: my_calendar
    binary_sensor:      
      - name: Calendar Agenda Search "My String"
        unique_id: custom_calendar_agenda_search_01_001
        state: |
          {{ trigger.event.data.cal_events['events']
          | map(attribute='summary') 
          | select('search', 'my string')
          | list | count > 0 }}
3

Thank you, but this throws an error for the state: value:

UndefinedError: ‘trigger’ is undefined

4

Where are you seeing that error? You can’t test templates that reference the trigger variable in the Template editor unless you provide the value for the variable.

5

Looks like calendar.list_events has been deprecated for calendar.get_events. This adds another layer to the data returned.

I was also unable to get select('search', 'my string') to work. search wasn’t a valid filter for select. I had to use equalto

alias: Calendar 1-Day Agenda to Event
trigger:
  - platform: time
    at: "00:01:00"
condition: []
action:
  - service: calendar.get_events
    data:
      start_date_time: "{{ today_at() }}"
      end_date_time: "{{ today_at('23:59:59') }}"
    target:
      entity_id: calendar.my_calendar
    response_variable: agenda
  - event: custom_calendar_agenda
    event_data:
      calendar: my_calendar
      cal_events: "{{ agenda }}"
mode: single

Binary Sensor:

template:
  - trigger:
      - platform: event
        event_type: custom_calendar_agenda
        event_data:
          calendar: my_calendar
    binary_sensor:      
      - name: Calendar Agenda Search "My String"
        unique_id: custom_calendar_agenda_search_01_001
        state: |
          {{ trigger.event.data.cal_events['calendar.my_calendar']['events']
          | map(attribute='summary') 
          | select('equalto', 'my string')
          | list | count > 0 }}