Facebook Graph Api Get Event By Id - facebook

Question

I am trying to receive an event from the Facebook Graph Api By Id with following request:
https://graph.facebook.com/{eventid}?access_token={app_accesstoken}
I am using an app-accesstoken. The Event is a public event and according to the Graph Api docs I should be able to receive public events with any access token: https://developers.facebook.com/docs/graph-api/reference/event/
Nevertheless I receive following error-response:
Unsupported get request. Object with ID '{eventid}' does not exist, cannot be loaded due to missing permissions, or does not support this operation. Please read the Graph API documentation at https://developers.facebook.com/docs/graph-api
I have tried with multiple events with the same results

Answer 1

In April 2018, following the Cambridge Analytics scandal, Facebook decided to greatly reduce the information available through Facebook API.
In particular regarding Events API, here the official statement.
Events API: Until today, people could grant an app permission to get information about events they host or attend, including private
events. This made it easy to add Facebook Events to calendar,
ticketing or other apps. But Facebook Events have information about
other people’s attendance as well as posts on the event wall, so it’s
important that we ensure apps use their access appropriately. Starting
today, apps using the API will no longer be able to access the guest
list or posts on the event wall. And in the future, only apps we
approve that agree to strict requirements will be allowed to use the
Events API.
After that change you will not be able to get events of Facebook Pages, using the Facebook API like in the old days.
You could be able to get the data of a page you own if you have user_event permission (https://developers.facebook.com/docs/graph-api/reference/user/events/) but your app need to pass the App Review process.
Source: https://newsroom.fb.com/news/2018/04/restricting-data-access/