WCPARC naturalist Shawn Severance leads a hike through the late fall prairie to honor the history and future of North America’s last megafauna, the mighty bison. Attendees are welcome to wear bison-tribute beards, real and fake. 2–4 p.m., Leonard Preserve, 375 N. Union, Manchester. Free, but preregistration required (capacity limited) at washtenaw.org/registerparks; #811009.