Facebook Invite Them All for Chrome is a useful extension that allows you to select all the contacts from your list when you want to invite everybody to a certain event. You can access the extension from the address bar button in order to select the friends from the list.
This extension can save you a lot of time when you organize several events and you want to invite every single friend.
Note: In order to install the extension you need to drag and drop the downloaded file in the Extensions tab.
· Google Chrome