Make your first call

curl \
  https://tp-apim-int.azure-api.net/calendar/v1/$CALENDAR_ID/events \
  -H "Ocp-Apim-Subscription-Key: $KEY"

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", key);
var events = await http.GetStringAsync(
    $"https://tp-apim-int.azure-api.net/calendar/v1/{calendarId}/events");

const response = await fetch(
  `https://tp-apim-int.azure-api.net/calendar/v1/${calendarId}/events`,
  { headers: { "Ocp-Apim-Subscription-Key": key } });
const events = await response.json();

import requests

response = requests.get(
    f"https://tp-apim-int.azure-api.net/calendar/v1/{calendar_id}/events",
    headers={"Ocp-Apim-Subscription-Key": key})
events = response.json()

$events = Invoke-RestMethod `
  -Uri "https://tp-apim-int.azure-api.net/calendar/v1/$calendarId/events" `
  -Headers @{ "Ocp-Apim-Subscription-Key" = $key }