GOSSIP AND GOODIES: Gossip go-to site PopSugar hosts the FreshGuide Girls' Night Out at Saks (5555 Wisconsin Ave., Chevy Chase, Md.). Score some 15-percent discounts, free manis and makeovers, plus snacks, giveaways and refreshments. 6-9 p.m.; free.
LOOK INSIDE: "Awakenings" author and famed neurologist Oliver Sacks speaks about his latest book "The Mind’s Eye," at Sixth and I Historic Synagogue (600 I St. N.W.). The book explores how people are able to function and communicate after losing what most people would consider indispensible senses or abilities. 7 p.m.; admission $8, or get two free tickets with the purchase of the book ($26.95) -- call Politics & Prose at 202-364-1919 to order.
HELP AND LISTEN: Crank Up the Cause at U Street Music Hall (1115 U St. N.W.) benefits Citizen Effect projects here and abroad. The night's performances include DJ KC of Fatback, DJ Magnus Magnusson and Will Rast. 6:30 p.m.; $10 minimum donation.
WATCH IT: Although tickets have already been distributed for the National Christmas Tree Lighting Ceremony, you can watch it live online, or on WETA on Friday, Dec. 10 at 9 p.m.
Let's Go Around Town: Keep up with what's happening in the D.C. area anytime, anywhere. Follow us on Twitter and Facebook. Sign up for our e-mail newsletters and find out What You're Doing Tonight with texts delivered right to your mobile phone -- just text DCTONIGHT to 622339 to sign up. (Message and data rates may apply.) Don't forget our iPhone app!