Yeah, in part, but after I invited people I knew, plus posted the event on my business's Facebook Page, there were only 40 or so people attending.

To me, it shows the power of combining native Facebook functionality like Events with Facebook Ads.

I've also talked with a LinkedIn "expert" who claimed that advertising LinkedIn events on LinkedIn had a much better conversion because you loose people when you go off site (i.e. from linkedin.com to yourdomain.com). By keeping people on the same platform, you should have a higher conversion rate. (according to one guy who does have a book deal but whatever)