So long, Thanksgiving. Hello, holiday party season! This week the Senate may be away, but the festivities are in play, starting with the lighting of the Capitol Christmas Tree at 5 p.m. Tuesday on the West Front and the Capitol Hill Chanukah Celebration at 5 p.m. Tuesday in the Capitol’s Mansfield Room.

And even if you’re not into indulging your inner Scrooge, there’s still plenty to do around Capitol Hill this week, including taking a look at some of the capital city’s dark secrets through the eyes of its most storied detective, and a concert at the Library of Congress by country royalty Rosanne Cash, daughter of the Man in Black.

D.C. P.I.

Bill Press sits down on Tuesday at Hill Center with Terry Lenzner, arguably the District’s most seasoned private investigator. Lenzner has a memoir out, “The Investigator: Fifty Years of Uncovering the Truth,” which the two will discuss. Lenzner’s seen it all in a long career, including the murders of civil rights workers in the South, Watergate, the Unabomber and any number of high and low crimes. Lenzner will sign copies afterward. At the Hill Center’s Abraham Lincoln Hall at 921 Pennsylvania Ave. SE, 7-9 p.m. Free, but register at Hill Center’s website.

LOC to Cash In

Roseanne Cash will be at the Library of Congress for a three-day residency that starts Thursday and goes through Sunday, a project that will reveal to the public her new album, “The River and the Thread,” and include a “round robin” with other singer-songwriters and talk with a fellow Southerner, Poet Laureate Natasha Trethewey. The eldest child of the late Johnny Cash has a more-than-three-decades-long career and is a country legend in her own right. The fact that she’s kicking off her tour in D.C. at the library speaks to her enduring cultural imprint. On Thursday, Cash will premiere her new album in a concert at the Thomas Jefferson Building’s Coolidge Auditorium at 101 Independence Ave. SE. The tunes start at 8 p.m. The concert is free, sort of: You have to get tickets through Ticketmaster, which will charge a processing fee. The LOC says advance tickets are sold out, but there should be a decent number of “rush” tickets at the door. Friday’s round robin with Cash, John Leventhal, Cory Chisel, Rodney Crowell and Amy Helm is at the Coolidge at 8 p.m. Her Saturday conversation with Trethewey at the Jefferson Building’s Whittall Pavilion is free.

https://www.youtube.com/watch?v=qGKDjW8AF-M

Eat, Drink, Vote, Read

The Roll Call Book Club wraps up its 2013 series with Marion Nestle, who’ll drop by CQ Roll Call HQ at 77 K St. NE on Thursday night to discuss her new book, “Eat Drink Vote: An Illustrated Guide to Food Politics.” Co-hosted by our pals at Hooks Books, drop by at 6 p.m. for a little wine, some cheese and a discussion on what’s on everyone’s mind: What’s to eat?