450 million people use Facebook Events

"In the latest Facebook earnings call, CEO Mark Zuckerberg said that Facebook Events now has 450 million users, a big jump in numbers that he says is now of "global scale." Of course, any Facebook user can tell you that this momentum with Events has been building for a while now. After all, why use sites like Evite and Eventbrite to organize parties if you can do so on a site that your friends and family likely already use? But the company isn't stopping there. In the coming weeks and months, Facebook is about to add even more features to Events, with a big push toward creating a bigger separation between public and private occasions."
Source:  Engadget, 17th August 2015
Note - I'm assuming the 450m is monthly active users
MAUs