CASSANDRA BUFFUM of Suttons Bay will travel to Europe this summer as part of the Blue Lake International Choral Ensemble. Buffum, a junior at Suttons Bay High School who recently played the female lead in the all-school production of The King and I, will spend three weeks in Europe during a four-country tour. Upon returning, the ensemble will perform a Blue Lake Benefit Concert in Hill Auditorium on the campus of the University of Michigan. She is the daughter of David Buffum of Suttons Bay and Gwen Groesser of Interlochen.