Based on the text in the eleventh chapter of the book, what does Penny's mother do to assure an ambiance of comfort in anticipation of Mr. Mulligan's visit to her home for dinner?

Based on the text in the eleventh chapter of the book, Penny's mother asks Penny and Pop-pop to be on their best behavior in order to assure an ambiance of comfort for Mr. Mulligan when he is scheduled to stop by to have dinner with her family.