Cat and Nat have become internet sensations by sharing their "their ultra-real and just a bit R-rated dispatches from the mom trenches." They talk about topics such as what not to eat a few days postpartum and the most effective ways to avoid postpartum sex. They come to the Agora tonight in support of their new book, Mom Truths. The event begins at 7, and tickets start at $35. (Niesel)