Callaway is running a contest on its Facebook page in conjunction with Justin Timberlake, the singer and actor who has been a Callaway staff professional since 2008. Participants can sign up at facebook.com/callaway and be entered to win one of 25 Diablo Octane drivers, or the grand prize – a day for two at Mirimichi, Timberlake's Tennessee golf course. It will include hitting balls with the singer, a custom fitting for a full set of Callaway clubs and an 18-hole game on the Championship Course there. The contest is inspired by the approach of Father's Day; Timberlake's dad introduced him to golf when he was young, and they own Mirimichi together. The contest runs through June 18, with finalists announced in July.