I want to invite a specific friend to dance, but they don't use the forums at all, so there's no place to click. Is there any other way to invite them?

If you use the notepad widget, you can use put the scode for their dance link into your notepad to click on :)

Ooh thank you very much! <3

They still have to wear a mask, though. They might not have thought of putting one on if they don't visit the forums.