There are several counter-balancing elements to consider when planning your events for prospects.
These elements must be aligned.
The topic must be interesting enough to a large group, but narrow enough to generate real interest. The topic must be represented honestly to attract attendees, but with excitement and intrigue to get them to attend. You must engage with strangers (prospects) without alienating your existing clientele. The only way to see yourself successfully through this process is to plan properly so you can act decisively.