I've got a Facebook group of over 3000 members. I recently created an event and invited everyone. Yet only 2 RSVP. 2 years ago, I ran same event on same group when it only had 800 members, and at that time, received 150+ rsvp. The event was a hit back then, so no idea what happened, this time. Are there similar cases where Facebook invites of large groups get suppressed invite delivery or glitches?