OnGrid is hosting an open track day at Thunderhill's road course, giving you seat time to push your car and work on your lines without the structure of a formal competition. Whether you're prepping for HPDE or just want to explore what your daily driver can do on a real track, this is your chance. Thunderhill's flowing layout makes it perfect for learning how your car handles under real conditions. Full details & registration: https://www.motorsportreg.com/events/ongrid-hill-2026-thunderhill-raceway-park-460227