@谢金是对的。您没有正确实现oncreateview方法。
我运行了你提供的代码，它工作得很好，我可以看到对话框，所以我认为问题不在这段代码。

public class TestFragmentActivity extends AppCompatActivity implements View.OnClickListener {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_fragment);
        findViewById(R.id.btn_click).setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        DialogPlusEvent dialogPlusEvent = new DialogPlusEvent();
        Bundle bundle = new Bundle();
        dialogPlusEvent.setArguments(bundle);
        dialogPlusEvent.show(fragmentManager, "DialogPlusEvent");
        Log.d("Dialog Fragment", "Working");
    }
}

public class DialogPlusEvent extends DialogFragment implements View.OnClickListener{
    TextView dpeTvPlaceName, dpeStar, dpeTvMyDistance;
    private String dpePlaceName;
    private Long dpeMyDistance;
    private Button dpeBtnOkay;
    public static DialogPlusEvent getInstance() {
        DialogPlusEvent dialogPlusEvent = new DialogPlusEvent();
        return  dialogPlusEvent;
    }
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.dialog_plus_event, container);
        setCancelable(false);
        return  view;
    }
    public void onClick(View view) {
        dismiss();
    }
}

你在执行 onCreateView 方法
把方法从 OnCreateView 至 onCreateView 如下所示：

@Nullable
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.dialog_plus_event, container);
        SharedPreferences sharedPreferences = this.getContext().getSharedPreferences("file", Context.MODE_PRIVATE);
        currentPage = sharedPreferences.getString("currentPage", "");
        /.../
        Bundle bundle = getArguments();
        dpePlaceName = bundle.getString("eventPlaceName");
        dpeMyDistance = bundle.getLong("currentUserDistance");
        dpeBtnOkay = view.findViewById(R.id.dpeBtnOkay);
        dpeBtnOkay.setOnClickListener(this);
        setCancelable(false);
        return  view;
    }