Take a dive into the icy Susquehanna River during the annual Penguin Plunge, noon Tuesday on City Island in Harrisburg. What better way to ring in the new year than a cold wake-up and the opportunity to race money for more than 500 homeless pets at the Humane Society of Harrisburg? There is no registration fee, but participants are asked to raise or donate at least $40. Registration starts at 10 a.m. For more information about the organization and to download a donation sheet, visit www.humanesocietyhbg.org.