---
title: "Record Participants by Email with Marketing Event External Ids"
method: POST
path: "/marketing/marketing-events/2026-03/attendance/{externalEventId}/{subscriberState}/email-create"
tags: ["Event Attendees"]
---

# Record Participants by Email with Marketing Event External Ids

`POST /marketing/marketing-events/2026-03/attendance/{externalEventId}/{subscriberState}/email-create`

Records the participation of multiple HubSpot contacts in a Marketing Event using their email addresses.

If a contact does not exist, it will be automatically created. The contactProperties field is used exclusively for creating new contacts and will not update properties of existing contacts.

Additional Functionality:
- Adds a timeline event to the contacts.

Allowed Properties:
For the state "attend":
- joinedAt
- leftAt

## Path parameters

- `externalEventId` string, required
- `subscriberState` string, required

## Query parameters

- `externalAccountId` string

## Request body

- MarketingMarketingEventsBatchInputMarketingEventEmailSubscriber
  - `inputs` MarketingMarketingEventsMarketingEventEmailSubscriber[], required — List of marketing event details to create or update
    - `contactProperties` object, required — The key-value set that contains properties of the contact.
    - `email` string, required — The email address of the contact in HubSpot to associate with the event.
    - `interactionDateTime` integer, required — Timestamp in milliseconds at which the contact subscribed to the event.
    - `properties` object, required — The key-value set that contains properties of the marketing event.

## Response `200`

successful operation

- MarketingMarketingEventsBatchResponseSubscriberEmailResponse
  - `completedAt` string, date-time, required — Timestamp that represents when the request finished processing
  - `errors` StandardError[]
    - `category` string, required — Error category.
    - `context` object, required — Error context.
    - `errors` ErrorDetail[], required — List of error details.
      - `code` string — The status code associated with the error detail
      - `context` object — Context about the error condition
      - `in` string — The name of the field or parameter in which the error was found.
      - `message` string, required — A human readable message describing the error along with remediation steps where appropriate
      - `subCategory` string — A specific category that contains more specific detail about the error
    - `id` string — Error ID.
    - `links` object, required — Error links.
    - `message` string, required — Error message.
    - `status` string, required — Error status.
    - `subCategory` object — Error subcategory.
  - `links` object — Result of the request
  - `numErrors` integer — The number of errors that occurred during the processing
  - `requestedAt` string, date-time — Timestamp that represents when the request was made
  - `results` MarketingMarketingEventsSubscriberEmailResponse[], required
    - `email` string, required — The email of the contact
    - `vid` integer, required — The internal ID of the contact
  - `startedAt` string, date-time, required — Timestamp that represents when the request started processing
  - `status` 'CANCELED' | 'COMPLETE' | 'PENDING' | 'PROCESSING', required — The status of the request processing

## Other responses

- `default` — An error occurred.

---

[API](https://skmtc.net/hubspot/apis/hubspot-api-specification.md) · [All operations](https://skmtc.net/hubspot/apis/hubspot-api-specification/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/hubspot/hubspot-api-specification/revisions/f9c7181056c5/schema)