If you are goiing to put the word otu to the public and try and get new collectors involved, especially younger ones, then your idea of having some type of topic at each meeting would be a good one. Some thoughts for newbies and even some mid-range collectors include: 1) Grading marbles - showing different types of damage - have examples of subsurface moons, fractures, etc.; 2) basics on older handmade collecting (some machine made collectors might find that interesting since they may not know much about it) but need someone with good examples of basic handmades; 3) same thing for machine mades with examples of various basic types - cat's-eyes, oxblood, metallic, corkscrew, Rainbo, NLR, CA, etc. 4) later on, if you get kids in attendance, you could have one meeting where there are some marble shooting games set up; 5) maybe a talk by someone who sells (and buys) successfully on eBay. Just some thoughts although I agree with Galen if you only have the "normal" group of collectors that come to shows, etc. By the way, keep the "learning" part to a half-hour or so, and if certain people want more info, they can talk to the speaker after the "talk".