Understand, especially regarding worship style.
If a church is in a diverse area, then this needs to be intentional. It doesn't just happen. I've seen it not work and I've seen it work. People can tell when they are truly welcome.
I remember the story from a friend who attended a church once where no one looked like him. While no one was overtly rude, not a single person greeted him either. Not surprisingly, he never went back. Thankfully, this was over 30 years ago so I would like to hope this wouldn't happen today.