Maybe I'm way off of what you are looking for but I first thought about this when I read your post.

Do a Google search for ABDL sites in your area. I know that in most larger urban centers, or anywhere there is a large number of freethinking people, they're going to be able to find organized ABDL event, munch or party dedicated to this. The acronym stands for adult baby diaper lovers. They are exclusively into role-playing, either as a little, or in a CGL relationship of some sort.

To help you learn the terminology, visit:

https://aboutabdl.weebly.com/glossary-of-terms.html