1. Log into your Facebook business page and create an event.
2. Choose Class. This allows to schedule a live stream within the event.
3. Press Paid.
4. Enter Name, time of the event, duration, etc. Then Press Next at the bottom.
5. Enter a fee for attending the event (watching your live stream). Press Next.
6. Choose Present a Live Broadcast and click Publish the event.
7. Then you'll see a button to set up a live video. Check this tutorial on how to schedule a live stream within your live event.