Photo by John Benevelli.

NICKELODEON: Where did green slime come from? How did Ren & Stimpy get approved to air? Find out this and more when Mathew Klickstein discusses his book SLIMED! An Oral History of Nickelodeon’s Golden Age. Nick-themed trivia will follow the discussion. Fair warning: Read this interview before buying tickets to the event. Washington DCJCC (1529 16th Street NW) 7:30-9 p.m. $13.50-16.50

ASSASSINATION: Robert B. Baer, former CIA agent and author of The Perfect Kill: 21 Laws for Assassins, joins Pulitzer Prize-winning journalist James Risen for a conversation about the history of political murder. Sixth & I Historic Synagogue (600 I Street NW) 7 p.m. $14-28

SEAN ASTIN: Yesterday he ran the Marine Corps Marathon and today he’ll stop at the National Press Club to discuss his political radio show, “Vox Populi.” National Press Club (529 14th Street NW) 6:30-7:30 p.m. $20

STAR TREK: The Museum of Science Fiction hosts a screening of Star Trek: The Next Generation fan-favorite episode “The Inner Light,” featuring a Q&A with award-winning screenwriter Morgan Gendel. Tenley-Friendship Neighborhood Library (4450 Wisconsin Avenue NW) 6:30-8:30 p.m. Free

Later this week…

TUESDAY: Participate in the concept creation of a new (hypothetical) sci-fi series during this three-part workshop. Computing Research Association (1828 L Street NW Suite 800) 7-9 p.m. (Tuesday-Thursday) $175

WEDNESDAY: Zipcar and Studio Theatre present “Throwback Throwdown,” a 90s themed Halloween party, featuring a costume contest and an open bar from 8 to 10 p.m. A cash bar will be available. Studio Theatre, Atrium (1501 14th Street NW) 8-12 a.m. Free

THURSDAY: Helix Lounge hosts their annual pumpkin carving contest, with prizes for the “Most Local-Themed Pumpkin” and “Most Ghoulish Gourd.” Pre-scooped pumpkins will be distributed to the first 30 guests on a first-come, first-serve basis. Hotel Helix Lounge (1430 Rhode Island Avenue NW) 6-9 p.m. Free