Because of lingering symptoms of a concussion suffered 16 months ago, Orioles second baseman Brian Roberts most likely will be skipping next weekend's FanFest at the Baltimore Convention Center. A club source said it was "highly doubtful" Roberts, who played in just 39 games in 2011 because of the concussion, would be at the Jan. 21 event but it "is not completely out of the realm of possibility." Roberts was originally slated to be there, and vouchers for one of his two joint autograph sessions had sold out. But he recently informed the club that, because he has been advised by doctors the event could cause further stress, he would not be attending. The team is hoping, however, that he changes his mind. Roberts did not return a phone call seeking comment.