Sundance and Slamdance make additions to 2020 line-ups

This week, both the Sundance Film Festival and the rival Slamdance Film Festival made some late additions to their 2020 line-ups:

• Sundance added “The Social Dilemma,” an inside look at how social media manipulates its users, to the Documentary Premieres section. It also added two “From the Collection” classics: Lisa Cholodenko’s groundbreaking lesbian drama “High Art” and the 2004 documentary “Born Into Brothels,” about Calcutta street kids.

• Slamdance announced its opening-night film will be Lynne Sachs’ documentary “Film About a Father Who,” a 35-years-in-the-making portrait of her father, Park City millionaire Ira Sachs Sr. Slamdance also announced its 81 short films, and some other features.