The Medford Public Library invites tweens ages 10 to 14 to celebrate 20 years of Percy Jackson by testing your knowledge in this Tween Trivia Challenge. All levels of knowledge of Rick Riordan’s fantasy novel series are welcome to join, whether you’ve just started reading Percy’s story or you’ve read it a hundred times. You’ll be using Kahoot to play the game, so if you have your own internet-enabled smartphone or tablet, please plan to bring it with you. The library will have a limited number of iPads available for those who do not have their own device. Registration is required through the library’s online calendar.