Expose Google Calendar event color and label (colorId and eventLabelId) in calendar events

[kaikri31]

Describe your core improvement

Expose Google Calendar event color (colorId) and event label (eventLabelId) in calendar events, the Google Calendar API exposes this information. However, when retrieving events through Home Assistant's Google Calendar integration (for example using calendar.get_events), the event color or label information does not appear to be available.

Current limitations

The Google Calendar API supports event-level colors and labels via the colorId and eventLabelId field, but this information is currently not exposed by the Home Assistant Google Calendar integration.

As a result:

• Event color and label information is lost when events are imported into Home Assistant.
• Frontend cards cannot reproduce the visual categorization already defined in Google Calendar.
• Automations cannot react differently based on event color/category/label.
• Multiple event categories within the same calendar cannot be distinguished without parsing event titles or creating separate calendars.
• Custom dashboard developers must rely on workarounds such as keyword matching or multiple filtered calendar entities.

For example, a user may use event colors in a single Google Calendar to distinguish work, travel, appointments and personal events. Once imported into Home Assistant, those distinctions are no longer available because the event color and label metadata is discarded.

Current output example from "calendar.get_events":

calendar.my_calendar:
events:
- start: "2026-07-14"
end: "2026-07-29"
summary: Work
- start: "2026-07-17"
end: "2026-07-20"
summary: Visit Family

This do not have the "ColorId" or the "eventLabelId" parameter from the Google Calendar API

Technical benefits

Google Calendar already exposes event-specific color metadata through the event colorId and eventLabelId property.

By exposing this information through Home Assistant's calendar event model and calendar.get_events service, Home Assistant would provide more complete access to calendar metadata that already exists in the upstream API.

Technical benefits include:

• Improved feature parity with Google Calendar.
• More complete event metadata available to automations, dashboards and custom integrations.
• Enables frontend components to display events using their original Google Calendar categorization.
• Establishes a reusable event attribute that can be used by any dashboard card, custom component or automation without requiring Google-specific API calls.
• Improves interoperability between Home Assistant's calendar integrations and frontend ecosystem.

This change would expose existing data already available from Google Calendar rather than introducing new functionality.

Additional context

No response