curl --request PATCH \
  --url https://api.hubapi.com/events/2026-03/event-definitions/{eventName} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "description": "<string>",
  "label": "<string>"
}
'

import requests

url = "https://api.hubapi.com/events/2026-03/event-definitions/{eventName}"

payload = {
    "description": "<string>",
    "label": "<string>"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({description: '<string>', label: '<string>'})
};

fetch('https://api.hubapi.com/events/2026-03/event-definitions/{eventName}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.hubapi.com/events/2026-03/event-definitions/{eventName}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'description' => '<string>',
    'label' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.hubapi.com/events/2026-03/event-definitions/{eventName}"

	payload := strings.NewReader("{\n  \"description\": \"<string>\",\n  \"label\": \"<string>\"\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.patch("https://api.hubapi.com/events/2026-03/event-definitions/{eventName}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"description\": \"<string>\",\n  \"label\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.hubapi.com/events/2026-03/event-definitions/{eventName}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"description\": \"<string>\",\n  \"label\": \"<string>\"\n}"

response = http.request(request)
puts response.read_body

{
  "archived": true,
  "associations": [
    {
      "allowsCustomLabels": true,
      "fromObjectTypeId": "<string>",
      "hasAllAssociatedObjects": true,
      "hasCascadingDeletes": true,
      "hasUserEnforcedMaxFromObjectIds": true,
      "hasUserEnforcedMaxToObjectIds": true,
      "hidden": true,
      "id": 123,
      "inverseAllowsCustomLabels": true,
      "inverseHasAllAssociatedObjects": true,
      "inverseId": 123,
      "inverseName": "<string>",
      "isDefault": true,
      "isInversePrimary": true,
      "isPrimary": true,
      "maxFromObjectIds": 123,
      "maxToObjectIds": 123,
      "name": "<string>",
      "portalUniqueIdentifier": "<string>",
      "readOnly": true,
      "toObjectTypeId": "<string>",
      "inverseLabel": "<string>",
      "label": "<string>"
    }
  ],
  "fullyQualifiedName": "<string>",
  "id": "<string>",
  "labels": {
    "singular": "<string>",
    "plural": "<string>"
  },
  "name": "<string>",
  "objectTypeId": "<string>",
  "properties": [
    {
      "description": "<string>",
      "fieldType": "<string>",
      "groupName": "<string>",
      "label": "<string>",
      "name": "<string>",
      "options": [
        {
          "hidden": true,
          "label": "<string>",
          "value": "<string>",
          "description": "<string>",
          "displayOrder": 123
        }
      ],
      "type": "<string>",
      "archived": true,
      "archivedAt": "2023-11-07T05:31:56Z",
      "calculated": true,
      "calculationFormula": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "createdUserId": "<string>",
      "currencyPropertyName": "<string>",
      "displayOrder": 123,
      "externalOptions": true,
      "formField": true,
      "hasUniqueValue": true,
      "hidden": false,
      "hubspotDefined": true,
      "modificationMetadata": {
        "archivable": true,
        "readOnlyDefinition": true,
        "readOnlyValue": true,
        "readOnlyOptions": true
      },
      "referencedObjectType": "<string>",
      "sensitiveDataCategories": [
        "<string>"
      ],
      "showCurrencySymbol": true,
      "updatedAt": "2023-11-07T05:31:56Z",
      "updatedUserId": "<string>"
    }
  ],
  "comboEventRules": {
    "composingRules": [
      {
        "count": 123,
        "eventTypeId": "<string>",
        "propertyFilters": [
          {
            "filterType": "PROPERTY",
            "operation": {
              "includeObjectsWithNoValueSet": true,
              "operationType": "<string>",
              "operatorName": "<string>",
              "propertyType": "bool",
              "value": true,
              "defaultValue": "<string>",
              "renderSpec": "<string>"
            },
            "property": "<string>",
            "context": {
              "objectTypeId": "<string>"
            },
            "filterInsightsId": 123,
            "frameworkFilterId": 123
          }
        ],
        "lookbackWindowDays": 123
      }
    ],
    "ruleBranches": "<array>"
  },
  "createdAt": "2023-11-07T05:31:56Z",
  "createdUserId": 123,
  "customMatchingId": {
    "primaryObjectRule": {
      "eventPropertyName": "<string>",
      "targetObjectPropertyName": "<string>"
    }
  },
  "description": "<string>",
  "detailTemplate": "<string>",
  "headerTemplate": "<string>",
  "primaryObject": "<string>",
  "primaryObjectId": "<string>",
  "updatedAt": "2023-11-07T05:31:56Z",
  "updatedUserId": 123
}

{
  "message": "Invalid input (details will vary based on the error)",
  "correlationId": "aeb5f871-7f07-4993-9211-075dc63e7cbf",
  "category": "VALIDATION_ERROR",
  "links": {
    "knowledge-base": "https://www.hubspot.com/products/service/knowledge-base"
  }
}