If you have an Events Access Token which expires every 60 days then you can extend it so that it never expires by following the directions below.
Important: if you don’t have an Events Access Token yet then you can get one by following the directions here.
1) Go to the following link: https://developers.facebook.com/tools/accesstoken/
2) Find the name of the app you set up, locate the “User Token”, and copy the entire token.
Note: It will still copy the entire token even though it has an ellipsis (…) at the end.
3) Paste it into the field below and click “Get an Extended Token”. This will generate a never-expiring Access Token for the Facebook page you’re displaying events from: