I mentioned on a group Q/A that you can promote your Facebook group while live on your Facebook Page.
You can also simultaneously stream into any other groups you have.
This video shows my set up and how to do this.
This is the equipment I use:
Ipad I use the 12 inch but you can also use your phone, so this isn’t needed.
Cordless Mic (optional, not needed)
Audio Interface (optional, not needed)
Arkon Mount stand