A newer app available for your iPhone called Friends Events does about what you would expect. It shows you all the events your Facebook friends are attending. Since Facebook has become popular among business and social circles as an event management and invitation tool, this iPhone app can really give you quick insights into the goings on of your Facebook friends.
A feature that I’m particularily fond of is the map feature. Instead of viewing events in a list you can view them on a map which will make it easier to find something to do near you. When you open an event you will see which of your friends has responded to the invitation and you can quick RSVP yourself, right within the app.