The 22nd Annual Bugs Bunny Film Festival with two-hour screenings from 4 p.m. to midnight Friday; noon to midnight Saturday; noon to 6 p.m. Sunday; and noon to midnight Monday at The Brattle Theatre, 40 Brattle St., Harvard Square. Tickets are $11.

The Brattle Theatre hosts its annual marathon of classic Warner Bros. cartoons, including the “All Bugs Revue” Friday and Sunday and “Daffy Duck and Friends” Saturday and Monday (all repeating after the long weekend, with a third show, the “Loony Tunes Revue,” coming the following weekend). Event information is here.

The Hasty Pudding Theatricals perform at noon Saturday at The Harvard Coop, 1400 Massachusetts Ave., Harvard Square. Free.

The Harvard student theatrical society brings its burlesque music and dance silliness to a free show, open to all – an annual tradition. Information is here.

Youth Underground Weekend from 5 to 7 p.m. Saturday and 3 to 5 p.m. Sunday at the Central Square Theater, 450 Massachusetts Ave., Central Square. Tickets are $10 for Saturday and Sunday (each with a $1 facilities fee online).

In these youth performances, The Delegates (ages 13-18) present “School Decoded,” a showcase of monologues and scenes about the unwritten rules of school, and The Ambassadors (ages 19-25) perform “Circle Up!,” an investigative theater play exploring the academic achievement gap. The pieces are created by Betsy Bard and directed by Vincent Ernest Siders with choreography by Rozann Kraus. Information is here.

Penny 4 Ya Thoughts? Valentine’s Edition storytelling from 8 to 10 p.m. Saturday (doors at 7:30 p.m.) at The Center for Arts at the Armory, 191 Highland Ave., Somerville. There is a suggested donation of $5, which will go to the ACLU.

Sad and single? Break up on or before Valentine’s Day? Come hear stories about bad dates, mostly Valentine’s themed, as well as a dating Q&A with “highly qualified” dating specialist Penny Oswin throughout the show and a segment that will help two guests find their special someone on Tinder. Comics telling their sad tales include Aaron “Tiny” Smith; Adam Kieval; Alec Vigliatura; Awet Teame; Carrie Wurst; Chris Post; Christa Weiss; Danny Killea; George Civeris; Kylie Alexander; Srilatha Rajamani; Terence Pennington; and Tim King. Information is here.

“Last Days Of Earth: The Work of Karen Jerzyk” photography reception from 8 to 11 p.m. Saturday at Eridanos Tattoo and Piercing art gallery, 36 Prospect St., Central Square. Free.

Jerzyk’s photography – shot in crumblings buildings into which she trespasses to stage elaborate, haunting works – will be up through March 15, but this is a chance to meet the artist and hear her tales of capturing bands and portraits and her trespassing arrest in August 2014, which she calls “the best thing to ever happen to her” professionally. Light refreshments will be provided. Information is here.

Lizard Lounge Poetry Jam 20th Anniversary Celebration from 8 p.m. Saturday to 1 a.m. Sunday and from 7:30 p.m. Sunday to 1 a.m. Monday at The Lizard Lounge, 1667 Massachusetts Ave., between Harvard and Porter squares. Tickets are $10 (or $11.34 with the online service fee Saturday) or Sunday (when there are no online sales).

The Lizard Lounge Poetry Jam and Slam turns 20 with headliner Iyeoka Ivie Okoawo as well as the Foundation Movement band and poets Bryonn Bain, Douglas Bishop, Rudy Ru, Wallace Coar Live, Christopher Johnson, Margot Malia Lynch, Jeannie Nunes, Vernon C. Robinson and Lexi Wight, with jazz by the Jeff Robinson Trio – and that’s just Saturday. The next evening (the jam’s traditional night) brings Patricia Smith as featured poet, as well as Harlym 1two5, Marlon Carey, Art Collins, Nicole Terez Dutton, Regie O’Hare Gibson, Cole Rodriguez, Patricia Martin-Rossi and Kit Yan, as well as an expanded Jeff Robinson band (known as the “Iced Tea Party”) with a horn section of Jeff Robinson, Ken Field and Todd Brunel; percussion by Phil Neighbors, Jerome Deupree and Dwight Hart; and strings and things by Blake Newman, Jonas Kahn and Mwalim Daphunkeeprofessor. Information for Saturday is here; and information for Sunday is here.

The 42nd Boston Science Fiction Film Festival 24-hour Marathon starting at noon Sunday at the Somerville Theatre, 55 Davis Square, Somerville. Tickets are $70 (or $71 with the online service fee).

The film festival will have been going for more than a week, emphasizing emerging directors with distinct visions from around the globe, before getting to this culminating ’Thon, a 24-hour orgiastic motion picture endurance test featuring classic, new and schlock films. “Think of it as binge viewing with 750 close friends,” organizers have said, contrasting stuff such as the much-loved “Galaxy Quest” (1999) and “Brazil” (1985) with some classic fare such as “Creature from the Black Lagoon” (1954). Games, contests and guests have traditionally been part of the schedule to help keep energy up. Information is here.