Waiting for something concrete to happen unexpectedly is absurd, anyways. So, what do you do?
First, if you truly believe in the unexpected, don't make plans (that doesn't apply generally) . Even if they become true, they'll always be less spectacular that the ones you've dreamt of. Second, if you truly don't believe in the unexpected, don't wait for it to change your life. There's no third. Just a song.