There are many small, random, quests that a player can find in Act V of Diablo III. Look for a brightly lit doorway, and go inside. Some kind of event will start.
Behind one of those brightly lit doorways is an event called “Cozy Bookstore”. It caught my attention because I love to read, have a tendency to buy more books than I can reasonably consume, and used to work in a big chain bookstore.