Use a HA card to add events to Google Calendars

add_gcal_event.yaml

######## You will need to create the following Helpers ############

# input_select.select_calendar
# input_text.cal_summary_text
# input_datetime.calendar_add_event_start_time
# input_datetime.calendar_add_event_end_time

#### scripts.yaml or use the UI ######

script.add_calendar_event_fe:
  alias: Add Calendar Event from Front End
  sequence:
  - service: google.add_event
    data_template:
      calendar_id: "{{ states('sensor.calendar_selector') }}"
      summary: "{{ states('input_text.cal_summary_text') }}"
      start_date_time: "{{ states('input_datetime.calendar_add_event_start_time') }}"
      end_date_time: "{{ states('input_datetime.calendar_add_event_end_time') }}"


#### configuration.yaml (or sensors.yaml) ######
sensor:
  - platform: template
    sensors:
      calendar_selector:
        friendly_name: "Calendar Selector Sensor"
        value_template: >
          {% set cal = states("input_select.select_calendar") %}
          {% if cal == "Main" %}
            [email protected]
          {% elif cal == "Household Reminders" %}
            [email protected]
          {% elif cal == "Work" %}
            [email protected]
          {% endif %}
 
 
 
#### lovelace entities card ######

type: entities
entities:
  - entity: input_select.select_calendar
    name: "Select Calendar to Add Event to:"
  - entity: input_text.cal_summary_text
    name: 'Type Summary Here:'
    type: 'custom:text-input-row'
  - entity: input_datetime.calendar_add_event_start_time
  - entity: input_datetime.calendar_add_event_end_time
  - action_name: Add Event...
    icon: 'mdi:calendar'
    name: ' '
    service: script.add_calendar_event_fe
    type: call-service