From Thinkwalks:
Thinkwalks walking tour (with Walk San Francisco)
Come explore the racial, political and cultural intensity that changed Hayes Valley from being a farm and graveyard to an urban dream, passing through its various ghetto phases along the way. We’ll walk a short distance through many years of change, from Grove and Market streets to Alamo Square. Meet at the public Library, Grove Street entrance, near Market Streeet. 2 & 1/2 hours.