Join the University of Tennessee Arboretum Society as Lisa Thomison, director and co-founder of the Owl Ridge Raptor Center, introduces the audience to some of the center’s feathered “ambassadors” from 10 a.m. to noon Saturday, Nov. 21, at the UT Arboretum Auditorium, 901 S. Illinois Ave., Oak Ridge. Several live raptors will accompany her as she discusses the work of this federally and state-licensed raptor rehabilitation center…