It's best to choose a category and arrange a meet if you're going to do that all by yourself. E.g. Classics, Staggered, JDMs, Tuners, Exotics and whatnot. As far as managing is concerned, contacts bro, you need contacts and a lot of them. If you have someone reliable on your corner who can put a word out for you and their word do mean something, people will show up.
People these days do not have time hence they do not wanna waste it by showing up on a meet where you end up looking around with empty parking space.