Nerd’s the word.

GRAZE
FamilyFarmed Expo Local Food Festival
What: Geek out over celeb chef demos, workshops, and a bumper harvest of samples (produce, cheese, meats, honey).
Why: The bizarrely useful seminar on raising backyard chickens.
When: Sat. Festival, 10 a.m.-6 p.m.; seminar, 12:30 p.m. Schedule online at familyfarmedexpo.com.
Where: UIC Forum, 725 W. Roosevelt Rd., at Union Ave. Tickets online at brownpapertickets.com.

SHOP
Selima Optique and Selima Vintage Sample Sale
What: Get vintage Dior frames and other chic specs from the boutique eyewear line at up to 50 percent off retail on Swirl.
Why: You’ve gotta see it to believe it.
When: While supplies last (but DailyCandy readers get exclusive early access, so hurry!).
Where: Online at swirl.com. Ongoing sales include UES, Eberjey, and Rogan.

CALCULATE
Chicago Nerd Social Club’s Pi(e) Day
What: Celebrate the ratio and the dessert with a pie-baking contest, math tests, trivia, and food and drink specials.
Why: The Pi Off, where competitors recite the number to the most decimals.
When: Sun., 5-10 p.m.
Where: Firkin & Pheasant, 670 W. Diversey Pkwy., b/t Orchard & Clark Sts. (773-327-7040). Tickets online at chicagonerds.com.

THRASH
Punkplay
What: Pavement Group’s sonic music-fueled presentation follows two suburban teens who stick it to the system.
Why: For anyone who has ever loved a mixtape.
When: Thru Apr. 25.
Where: Steppenwolf Merle Reskin Garage Theatre, 1624 N. Halsted St., at North Ave. Tickets at 312-335-1650 or online at steppenwolf.org.

GAWK
Chicago Zine Fest
What: Join self-publishing nuts for film screenings, readings, workshops, and art shows.
Why: The appearance by artist and animator Lilli Carré.
When: Fri., 7-11 p.m.; Sat., 10 a.m.-5 p.m.
Where: Check chicagozinefest.org for locations.

BUY
Le Dress Spring Preview Sale
What: The boutique knocks 15 percent off of easy, breezy designer frocks.
Why: Florals by Shoshanna, ruffles by Susana Monaco, and brights by Trina Turk.
When: Thurs., 11 a.m.-8 p.m.; Fri., 11 a.m.-7 p.m.; Sat., 11 a.m.-6 p.m.; Sun., 11 a.m.-5 p.m.
Where: 1741 W. Division St., b/t Hermitage Ave. & Wood St. (773-697-9899).

Photo: Thinkstock