I think a small group is a good idea. I was introduced to the ladies in my bee by a woman who coordinates the small groups at my larger guild.
if you enjoyed the lecture and might go again to the big group I suggest you ask if they have smaller groups and then consider joining one or starting one. If the larger group has a newsletter you could see if you could post something there asking if people would like to meet with you and post just what you wrote above with your contact info.