You can’t see their faces, but you can tell they’re having a blast. A young Black man in a suit dances by himself, his back turned to you. Across from him, a woman in her Sunday best dances as her hair swings in front of her face. We don’t know who they are, where they are, what year it is or why they’re dancing. That’s the point. At “Good Times,” Miami-based artist Chris Friday’s latest exhibition, Black people can have fun in peace.