> ## Documentation Index
> Fetch the complete documentation index at: https://developer.z-api.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Respond to event

> Send an attendance response to an event

## Overview

With this method you can send response messages to an event.

<Info>
  You cannot respond to an event you created yourself. Your response will always be marked as "confirmed presence".
</Info>

#### Example on WhatsApp

<div style={{ display: "flex", justifyContent: "center" }}>
  <img src="https://mintcdn.com/z-api-8aa3bb40/nNYp_QHy_iUs4_xM/images/send-event-response-eng.jpeg?fit=max&auto=format&n=nNYp_QHy_iUs4_xM&q=85&s=235973a8c2ba47b8c582991c37fdecd5" width="400" data-path="images/send-event-response-eng.jpeg" />
</div>

***

## Attributes

### Header

<ParamField path="instanceId" type="string" required>
  Your instance ID. Available in the Z-API panel under **Instances**.
</ParamField>

<ParamField path="token" type="string" required>
  Your Z-API instance token.
</ParamField>

### Required

<ParamField body="phone" type="string" required>
  Recipient group ID
</ParamField>

<ParamField body="eventMessageId" type="string" required>
  Original event message ID
</ParamField>

<ParamField body="eventResponse" type="string" required>
  Event response: `GOING` or `NOT_GOING`
</ParamField>

***

## Request Body

```json theme={"theme":{"light":"github-light","dark":"poimandres"}}
{
  "phone": "120363019502650977-group",
  "eventMessageId": "D2D612289D9E8F62307D72409A8D9DC3",
  "eventResponse": "GOING"
}
```

***

## Response

### 200

```json theme={"theme":{"light":"github-light","dark":"poimandres"}}
{
  "zaapId": "3999984263738042930CD6ECDE9VDWSA",
  "messageId": "D241XXXX732339502B68",
  "id": "D241XXXX732339502B68"
}
```

### 405

Make sure you are correctly sending the method specification, that is, verify that you sent POST or GET as specified at the beginning of this topic.

### 415

If you receive a 415 error, make sure to add the "Content-Type" header to your request, which in most cases is "application/json".