Saw this photograph on the site of the International Guild for Miniature Artisans (IGMA) and it was thougth to have been taken around 1910. One of the commenters referred to an organization called the Carousel Modelers and Miniature Association, in case you want to check it out.
The IGMA sponsors a trade show in the New York area every year, usually in August. To become a certified artist, you have to submit work that is judged on factors such as scale, authenticity of materials and quality of craftsmanship. Many people do not get certified the first time they apply. The Guild also sponsors a school in Castine Main every year. It's website used to be just a listing of members, but I see now they have a blog and a very good forum where you can learn/share techniques and projects.
IGMA Guild School
Images from IGMA Artisans or Fellows