Name tags can be used really badly. Welcoming new people by making them put on a name tag is rarely a good idea. But why?
The value of name tags is to help create group identity.
Asking people who aren’t sure if they want to be in the group to wear a sign of being “in” just doesn’t work. They know they’re not “in” and wearing a name tag says they are “in”.
So why not using it when you gather together the people who are already “in”? Training events, Conferences, even getting a few Growth GRoups together for a social night. They are good opportunities to bring out the ol’ name tags and consolidate the group-ness.
Also, as group gets bigger, you can’t expect people to actually know the names of all the other people who are “in”. So make it easy on them and give them name tags.