CitySSMIt’s that time of year again.  The annual Civic Centre Green Days goes on Thursday at 11:00 a.m. near the Civic Centre — at the international flag display.  A hyrdangea garden is this year’s project — involving species of flowering plants primarily native to southern and eastern Asia.   Following the dedication ceremony for the garden, a guest speaker from the Invasive Species Centre will make a presentation near the water fountain.