Bored on Halloween weekend? Puh-lease. Not a ghost of a chance.

GO
Red Masque Ball
What: Costume party benefiting Michael Reese HIV Care Program.
Why: The dance floor is monster mash-ready.
When: Fri., 8 p.m.-2 a.m.
Where: Congress Theater, 2135 N. Milwaukee Ave., at Rockwell St. (312-924-1886).

RiNo Opening
What:  New addition to the late-night lounge scene.
Why: “Boo”-ty calls, of course.
When: Fri., 5 p.m.-4 a.m.; Sat., 6 p.m.-5 a.m.
Where: 343 W. Erie St., at Orleans St. (312-587-3433).

EAT
The Oak Park Abbey Opening
What: Wine and Champagne bar hits the ’burbs.
Why: No toil and trouble. Just bubbly.
When: Fri. & Sat., 4 p.m.-midnight; Sun., 4-11 p.m.
Where: 728 Lake St., b/t Oak Park & Euclid Aves., Oak Park (708-358-8840).

HEAR
Kate Earl
What: Alaskan songstress of piano-driven pop.
Why: Lovely, haunting lyrics.
When: Fri. at 6 p.m.
Where: House of Blues, 329 N. Dearborn St., b/t Wacker Dr. & Kinzie St. (312-923-2000).

BUY
C.O. Bigelow Apothecaries Opening
What: N.Y. beauty emporium lands downtown.
Why: A world without cosmetics? Altogether ooky.
When: Opening, Thurs., 10 a.m.-9 p.m. Thereafter, Mon.-Fri., 10 a.m.-9 p.m.; Sat., 10 a.m.-8 p.m.; Sun., noon-6 p.m.
Where: Water Tower Place, 835 N. Michigan Ave., at Pearson St. (312-642-0551).