Plenty of people in San Diego understand far more English than they feel safe speaking. They can read it, follow it on the phone, get through a shift in it. What they haven't had is an unhurried hour with somebody willing to wait through a sentence instead of finishing it for them.
That's the whole idea. Not a class and not a course — an hour a week with the same person, until the sentences come easier.
We also visit schools with lessons about where fear of outsiders comes from. That work matters to us, but it's the smaller half, and it probably isn't why you're on this page.