You really w ant to set how publican event is BEFORE you start adding addresses or inviting your friends.If you create your event through the publisher (home page or profile), it will be a public even by default. This means anyone can see it, search for it, see the address and see who is invited. Not good if it's at your house!
It also goes straight to your update feed while it,s still public. So, make sure you don't use this when the name of the event is something like "Surprise birthday party for Kelly".
If you create the ev ent using the "What are you planning" box of the home page you can set it to be public or private using the padlock.
Or, when you edit the ev ent, make sure you un-check the public box. I f your event is public it is not just seen by all of your friends: it is also public for everyone on Facebook.
The other priv acy option listed: to show or hide the guest list. For larger events, where the guests don't necessarily know each other, it's probably best to hide the guest list. Decide before you invite people. Also, be carefulw ith exact addresses and too many details. Don't put private details into a public event!
"Facebook Tips: Events Privacy"