How to invite a users friends to an event? Facebook Graph API

Question

I have an application using the Graph API. I have it creating events for the user, but would like to let the user invite their friends from our site instead of having to go

Answer 1

see Inviting selected users to Facebook-Event (via Graph API)

Facebook now has a graph api for inviting friends to events.

http://developers.facebook.com/docs/reference/api/event/

invited

Create

You can invite users to an event by issuing an HTTP POST to /EVENT_ID/invited/USER_ID. You can invite multiple users by issuing an HTTP POST to /EVENT_ID/invited?users=USER_ID1,USER_ID2,USER_ID3. Both of these require the create_event permission and return true if the invite is successful.

And the answer to your side question is here: Attach image to Facebook event (php sdk, rest or graph api)