Check a local calendar for events (in the next 365 days) colliding with a public holiday. Create a persistent notification with the list of colliding holidays.

calendar_check_public_holidays_collistions.yaml

blueprint:
  name: Create Calendar Events with Offset Holidays in Week
  description: >-
    Check a local calendar for events (in the next 365 days) colliding 
    with a public holiday. Create a persistent notification 
    with the list of colliding holidays.
  domain: script
  source_url: https://gist.github.com/bruxy70/ea10d440117abe90009769268effe90c
fields:
  source_calendar:
    name: Source calendar
    description: Calendar with the events to be copied from
    required: true
    selector:
      entity:
        filter:
          integration: local_calendar
  public_holidays:
    name: Public Holidays
    description: Calendar with the public holidays to be avoided
    required: true
    selector:
      entity:
        filter:
          integration: holidays
sequence:
  - service: calendar.list_events
    data:
      duration:
        days: 365
    target:
      entity_id: "{{ source_calendar }}"
    response_variable: source
  - service: calendar.list_events
    data:
      duration:
        days: 365
    target:
      entity_id: "{{ public_holidays }}"
    response_variable: holidays
  - variables:
      holiday_dates: |-
        {%- set ns = namespace(dates={}) %}
        {%- if holidays.events %}
          {%- for event in holidays.events %}
            {%- set ns.dates = dict(ns.dates, **{event.start:event.summary}) %}
          {%- endfor %}
        {%- endif %}
        {{ ns.dates }}
  - service: persistent_notification.create
    data:
      title: Calendar collisions
      message: |-
        {%- set ns = namespace(collisions=[]) %}
        {%- if source.events %}
          {%- for event in source.events %}
            {%- if event.start in holiday_dates %}
              {%- set collision = event.start + " (" + holiday_dates[event.start] + ")" %}
              {%- set ns.collisions = ns.collisions + [ collision ] %}
            {%- endif %}
          {%- endfor %}
        {%- endif %}
        {%- if ns.collisions == [] %}
          No collisions
        {%- else %}
          {{ ns.collisions }}
        {%- endif %}
mode: single
icon: mdi:calendar-alert-outline