Those gorgeous ribs don't use much fat as they are roasted with the hoisin sauce. The chow mein range doesn't use too much oil either.
One night off the diet shouldn't hurt too much, just see it as a treat and go for what you fancy. It will probably do you more good than fretting over how much fat you're eating and ruin your night out.
According to my Slimming World book, Hot & Sour Soup, Beef or Chicken in Black Bean Sauce, Beef with Mushrooms, Chicken in Oyster Sauce, and plain boiled rice.
Anything steamed rather than fried. Avoid fat where possible. Or not worry, eat enough rather than whatever you see, and then pick up the diet again tomorrow. It is a rare event after all, isn't it ?