const events = await client.events.retrieve([{id: 123}, {externalId: 'abc'}]);

{
  "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>"
    }
  ]
}