Mingle!EditWalk up to a villager, and click "Talk To Me!" or something sort of like that. The villager will start a conversation with you. They might talk about events coming up soon, their opinion aon you and other villagers, and they might even show you letters they recieved! And if you write them letters, they'll show them to others who play- so don't write anything dirty in your letters!
Sometimes, if 2 villagers are nearby, they will talk. You can press A and listen to the conversation, and if you don't, the villagers will just change their clothing and moods.