It’s remarkable how this has changed. Back in what I call the “Facebook golden age” (2012-2016), before it turned to complete crap, it was unthinkable to host an event that was NOT organized by Facebook. I recall throwing birthday and holiday parties and all I had to do was scroll through my friends list and invite everyone and that was that. Everyone would see it and everyone would RSVP.
Oh well - it was nice while it lasted.