“Girls vs. Boys” Northwestern Night: At the House Theatre (1543 W. Division St.), 8-11 p.m. $15 seated tickets with use of code “IAMASTUDENT” or $10 pit seats with “ORGY” at thehousetheatre.com. Sex, drugs and parties are the primary focus of the teenagers in this hip, fast-paced musical. Think “Skins” or “Degrassi.”

“Bye Bye Liver: The Chicago Drinking Play:” At Fizz Chicago Bar & Grill (3220 N. Lincoln Ave.), Friday, 8 p.m. and 10 p.m. $20.Sketch comedy revolving around booze and interactive drinking games. A different-and equally effective-way of getting wasted this weekend.

3-D Universe: A Symphony: At Adler Planetarium, Saturday, 10 a.m. to 4:30 p.m. $19.Breathtaking images of the universe accompanied by composer Modest Mussorgsky’s most famous piano composition, “Pictures at an Exhibition.” A special treat for those who couldn’t celebrate 4/20 the day of. Or if you just want to celebrate again.

Andersonville Zombie Pub Crawl: Pre-registration at U.S. Bank (5340 N. Clark St.), Saturday, 2-8 p.m. $20-$25.Halloween’s not for six months, but it’s never too early to act like a zombie. But then again, you could save that impression for the morning after. Bonus points if you know the “Thriller” dance by heart.

Pajama Jam Brunch: Bull & Bear (431 N. Wells St.), 10 a.m.-4 p.m. No cover.Put on your footie pajamas and watch your favorite Saturday morning cartoons, all while noshing on a delicious brunch. Just like the good old days, except this time it’s eggs benedict instead of a bowl of cereal and a bloody mary instead of orange juice (plus a hangover, of course).

A&O Productions Presents “The Hurt Locker:” At McCormick Auditorium, Sunday, 7:30 p.m. Free.Didn’t get a chance to catch the Academy’s Best Picture Award winner in theaters? Watch the adrenaline-packed war film at no charge this weekend. Because free is always better and now you will finally know what all the fuss is about.