const events = await client.events.update([{id: 123, update: {description: {set: 'New description'}}}]);

event = client.events.retrieve(id=1)
event.description = "New description"
res = client.events.update(event)

from cognite.client.data_classes import EventUpdate
my_update = EventUpdate(id=1).description.set("New description").metadata.add({"key": "value"})
res = client.events.update(my_update)

client.events().upsert(upsertEventsList);

curl --request POST \
  --url https://{cluster}.cognitedata.com/api/v1/projects/{project}/events/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    {
      "update": {
        "externalId": {
          "set": "my.known.id"
        },
        "dataSetId": {
          "set": 123
        },
        "startTime": {
          "set": 123
        },
        "endTime": {
          "set": 123
        },
        "description": {
          "set": "<string>"
        },
        "metadata": {
          "set": {
            "key1": "value1",
            "key2": "value2"
          }
        },
        "assetIds": {
          "set": [
            123
          ]
        },
        "source": {
          "set": "<string>"
        },
        "type": {
          "set": "<string>"
        },
        "subtype": {
          "set": "<string>"
        }
      },
      "id": 4503599627370496
    }
  ]
}
'

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{cluster}.cognitedata.com/api/v1/projects/{project}/events/update",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'items' => [
        [
                'update' => [
                                'externalId' => [
                                                                'set' => 'my.known.id'
                                ],
                                'dataSetId' => [
                                                                'set' => 123
                                ],
                                'startTime' => [
                                                                'set' => 123
                                ],
                                'endTime' => [
                                                                'set' => 123
                                ],
                                'description' => [
                                                                'set' => '<string>'
                                ],
                                'metadata' => [
                                                                'set' => [
                                                                                                                                'key1' => 'value1',
                                                                                                                                'key2' => 'value2'
                                                                ]
                                ],
                                'assetIds' => [
                                                                'set' => [
                                                                                                                                123
                                                                ]
                                ],
                                'source' => [
                                                                'set' => '<string>'
                                ],
                                'type' => [
                                                                'set' => '<string>'
                                ],
                                'subtype' => [
                                                                'set' => '<string>'
                                ]
                ],
                'id' => 4503599627370496
        ]
    ]
  ]),
  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://{cluster}.cognitedata.com/api/v1/projects/{project}/events/update"

	payload := strings.NewReader("{\n  \"items\": [\n    {\n      \"update\": {\n        \"externalId\": {\n          \"set\": \"my.known.id\"\n        },\n        \"dataSetId\": {\n          \"set\": 123\n        },\n        \"startTime\": {\n          \"set\": 123\n        },\n        \"endTime\": {\n          \"set\": 123\n        },\n        \"description\": {\n          \"set\": \"<string>\"\n        },\n        \"metadata\": {\n          \"set\": {\n            \"key1\": \"value1\",\n            \"key2\": \"value2\"\n          }\n        },\n        \"assetIds\": {\n          \"set\": [\n            123\n          ]\n        },\n        \"source\": {\n          \"set\": \"<string>\"\n        },\n        \"type\": {\n          \"set\": \"<string>\"\n        },\n        \"subtype\": {\n          \"set\": \"<string>\"\n        }\n      },\n      \"id\": 4503599627370496\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", 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))

}

require 'uri'
require 'net/http'

url = URI("https://{cluster}.cognitedata.com/api/v1/projects/{project}/events/update")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"items\": [\n    {\n      \"update\": {\n        \"externalId\": {\n          \"set\": \"my.known.id\"\n        },\n        \"dataSetId\": {\n          \"set\": 123\n        },\n        \"startTime\": {\n          \"set\": 123\n        },\n        \"endTime\": {\n          \"set\": 123\n        },\n        \"description\": {\n          \"set\": \"<string>\"\n        },\n        \"metadata\": {\n          \"set\": {\n            \"key1\": \"value1\",\n            \"key2\": \"value2\"\n          }\n        },\n        \"assetIds\": {\n          \"set\": [\n            123\n          ]\n        },\n        \"source\": {\n          \"set\": \"<string>\"\n        },\n        \"type\": {\n          \"set\": \"<string>\"\n        },\n        \"subtype\": {\n          \"set\": \"<string>\"\n        }\n      },\n      \"id\": 4503599627370496\n    }\n  ]\n}"

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

{
  "items": [
    {
      "id": 4503599627370496,
      "lastUpdatedTime": 1730204346000,
      "createdTime": 1730204346000,
      "externalId": "my.known.id",
      "dataSetId": 4503599627370496,
      "startTime": 1730204346000,
      "endTime": 1730204346000,
      "type": "<string>",
      "subtype": "<string>",
      "description": "<string>",
      "metadata": {},
      "assetIds": [
        4503599627370496
      ],
      "source": "<string>"
    }
  ]
}

{
  "error": {
    "code": 400,
    "message": "`null` values aren't allowed."
  }
}

{
  "error": {
    "code": 429,
    "message": "Project exceeded maximum number='50' of concurrent requests. Please try again later."
  }
}