I get this email nearly every week, and it says, "Ben, I'm freaking out. How do I drive more RSVPs?" Or, "Oh Jeez, we haven't gotten enough people to RSVP. I'm nervous about not filling the room."
Have you been there? I definitely have. It's terrifying, right? You can spend all this time planning and thinking about how to create the perfect event, and you just aren't able to actually get people to RSVP or to attend.
Now, there might be a lot of reasons for this, and it could be something like your distribution mechanisms, timing of the event, or that people just aren't interested. What I've found more often than not is when I look at people's messaging or promotional material -- they've usually missed a couple things and haven't gotten people to understand the value of their event.