Communitas mods have random events. There are also some other changes you will have to deal with as well, but overall they claim it is to better the game.
Here's a link
http://steamcommunity.com/sharedfiles/filedetails/?id=86369999
If you wanna play a little different civ 5 game try this mod
Here's a link
http://steamcommunity.com/sharedfiles/filedetails/?id=86369999
If you wanna play a little different civ 5 game try this mod