You’re in trouble now, September. Better get out of here on the count of three. One. Two …

DO
Open Air Book Fair
What: Tens of thousands of books, CDs, and DVDs for $1, thrift clothes sold by the bag, and snacks from Savoy.
Why: You’re cheap. Now it’s out in the open.
When: Sat., 10 a.m.-6 p.m.
Where: 126 Crosby St., b/t Houston & Prince Sts.

BUY
Angel Sanchez Evening and Bridal Sale
What: Tulle gowns were $3,400, now $200; lace cocktail gowns were $3,740, now $500.
Why: Whether you’re always a bridesmaid, occasionally a bride, or sporadically a mistress.
When: Thurs., 9 a.m.-7 p.m.
Where: 526 Seventh Ave., b/t 38th & 39th Sts., 9th flr. (212-921-9827).

Luca Luca Sale
What: Up to 80 percent off gowns, dresses, jackets, knits, tops, skirts, pants, and shoes.
Why: Don’t discount the bargain bins!
When: Thurs.-Sun., 9 a.m.-7 p.m.
Where: 19 W. 36th St., b/t Fifth & Sixth Aves., 4th flr. (212-755-2444). R.S.V.P. to rsvp@lucaluca.com.

SEE
Issue Project Room
What: Animated shorts, a spirited sextet, and a darkly choreographed trio presented in a round room.
Why: It’s better in the round.
When: Thurs., 8 p.m.
Where: 400 Carroll St., b/t Bond & Nevins Sts., Carroll Gardens (718-330-0313).

HEAR
La Bohème
What: Terrific staging of the original Rent — for a mere $25.
Why: The thrill of telling the office, “Oh, I went to the opera this weekend.”
When: Sun., 1:30 p.m. Thru Oct. 26.
Where: City Opera, 20 Lincoln Center Plaza, at 62nd St. Tickets at 212-721-6500.