Who, do you think, is in charge of such information? The United States government? SETI? the United Nations? You might be surprised by just how this earth-shaking event would be handled. And we are dealing with not just one kind of contact, but two; a verified alien signal, and/or direct contact with no prior notice.
Check out part 1 at If We Receive a Verified Alien Signal, then What?, and be sure to comment as you wish.