“Never argue during a circus.” That’s sound advice for any relationship, but for George Carlin, it held an extra significance: all of life often was a circus anyway. This and other relationship axioms, like “Compliment and flatter Sally all day long,” are found in the new book by Carlin’s wife Sally Wade, The George Carlin Letters: The Permanent Courtship of Sally Wade. For the last 10 years of his life, Carlin sent his wife love notes: some goofy, some profane, all very romantic in their own way. Wade reads and discusses the book on Tuesday, June 21, at Book Passage. 51 Tamal Vista Blvd., Corte Madera. 7pm. Free. 415.927.0960.