If you saw a roving gang of 15 bike riders around the neighborhood last Saturday, it was the Historic Districts Council’s Victorian Flatbush Bike Tour [http://hdc.org/uncategorized/six-to-celebrate-victorian-flatbush-bike-tour], part of HDC’s Six to Celebrate [http://ditmasparkblog.com/neighborhood-history/the-historic-district-council-celebrates-vicotrian-flatbush] advocacy program. The tour was led by