Register at LIBRARY website for this free event. Your cat is already king (or queen) of the castle. Time to build him or her a structure worthy of feline royalty. Just in time for holiday gift-giving, you can make a customized cardboard castle (or boat, food truck or airplane) for your furry friend. The library will supply cardboard boxes and embellishments; you supply the creativity. Instructions and guidance available. Register online (link included in “find tickets” section; event is free) or call the library.