GET /v2.1/{event-id} HTTP/1.1
Host: graph.facebook.com

/* PHP SDK v5.0.0 */
/* make the API call */
$request = new FacebookRequest(
  $session,
  'GET',
  '/{event-id}'
);
$response = $request->execute();
$graphObject = $response->getGraphObject();
/* handle the result */

/* make the API call */
FB.api(
    "/{event-id}",
    function (response) {
      if (response && !response.error) {
        /* handle the result */
      }
    }
);

/* make the API call */
new GraphRequest(
    AccessToken.getCurrentAccessToken(),
    "/{event-id}",
    null,
    HttpMethod.GET,
    new GraphRequest.Callback() {
        public void onCompleted(GraphResponse response) {
            /* handle the result */
        }
    }
).executeAsync();

// For more complex open graph stories, use `FBSDKShareAPI`
// with `FBSDKShareOpenGraphContent`
/* make the API call */
FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc]
                               initWithGraphPath:@"/{event-id}"
                                      parameters:params
                                      HTTPMethod:@"GET"];
[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection,
                                      id result,
                                      NSError *error) {
    // Handle the result
}];