What's Your Favorite Weekly Food Special?

Sometimes, restaurant dining is even more fun if it feels like a weekly ritual. Certain diners are known to flock to restaurants for a particular nightly special, come rain or come shine. D.C. has some good options, whether it be French steak night at Society Fair, Dover sole night at Le Diplomate, or even half-priced burger nights at a variety of the city's bars. Today's open thread wants to know, "What's Your Favorite Restaurant Weekly Food Special or Theme Night? Share thoughts in the comments, or send a note to the always-open tipline.