Eikou Sumura, a Sogetsu master instructor from Tokyo, Japan, will present a flower arranging demonstration and workshop sponsored by The Japan Society of Boston. The demonstration will take place Thursday, September 30, beginning at 10 am at New Bridge on the Charles, 5000 Great Meadow Road in Dedham.  The workshop will be held Friday, October 1 beginning at 9:30 am at Elm Bank, in the East Wing, 900 Washington Street, Wellesley, Massachusetts.  For more information, including directions, call 508-270-6759, or log on to www.ikebanaboston.org.