Ground Scores: Guided Tours of San Francisco Past and Personal will offer cartographical and audio portraits of sites that reveal the city’s forgotten histories, as well as mapping out invisible networks within the city’s infrastructure. Sat, Oct 18, 2–5pm, An Unnatural History of Golden Gate Park Walking tour. The Studio for Urban Projects team up with landscape designers, ecologists and park historians to illuminate Golden Gate Park’s complex history. Tour meets on the steps of the Conservatory of Flowers on Kennedy Drive.