Follow these steps:
- Login to your Facebook Account.
- Click on the Events in the left.
- At the Top - right side, you can find Today.
- Click on the gear button at the right of Today.
- Drop down menu appears, Click on Export.
- A Pop-Up appears,
- If you want to import your Facebook friends' birthdays to Google calendar then copy link address of "export your friends' birthdays".
- If you can to import upcoming Facebook events to Google calendar copy link address of "upcoming events".