What’s in the horn of plenty? SCOPE Kinokuniya Opens What: Premier Japanese bookstore offers in-store fashion, art, and cultural events, like Zen cooking demos and photo exhibits. Why: It’s huge in Japan! When: Mon.-Sat., 10 a.m.-8 p.m.; Sun., 11 a.m.-7 p.m. Where: 1071 Sixth Ave., b/t 40th & 41st Sts. (212-869-1700). EAT The Mermaid Inn Opens Uptown What: Fancy East Village fish shack goes uptown. And they’re taking the lobster sandwich with them. Why: Wainscotting, harbor maps, raw bar. How are your sea legs? When: There’s something fishy going on. Mon.-Thurs., 5-11 p.m.; Fri. & Sat., 5-11:30 p.m.; Sun., 5-10 p.m. Where: 568 Amsterdam Ave., b/t 87th & 88th Sts. (212-799-7400). SHOP Form SS08 Sale & Tibi Sample Sale What: A futuristic, romantic, conceptual collection from Form. Take 80 percent off samples and 56 percent off overstock from pattern-heavy Tibi. Why: Great winds for a sale. When: Form, Thurs. & Fri., 4-8 p.m.; Tibi, Thurs., 10 a.m.-7 p.m.; Fri., 10 a.m.-6 p.m. Where: Form Studio, 510 Broome St., b/t W. Broadway & Thompson St., ste. 7e (646-216-9194); Tibi, Loft 11, 336 W. 37th St., b/t Eighth & Ninth Aves. (212-966-3773). Steven Alan Sample Sale What: Cotton shirts, cashmere sweaters, silk dresses, poplin pants, denim, and more for men and women are up to 80 percent off. Why: It’s back! When: Thurs. & Fri., 8:30 a.m.-8 p.m.; Sat., noon-7 p.m.; Sun., noon-5 p.m. Where: SAS Showroom, 87 Franklin St., b/t Church St. & Broadway (212-219-3305). SCOUT Underground-NYC What: More than 100 emerging designers showcase their wares at this new 10,000-square-foot space. Why: Hit the Underground running. When: Tues.-Fri., 11 a.m.-7 p.m. Where: 1031 Sixth Ave., at 39th St. (212-239-7275). SWEAT Physique 57 Downtown Opens What: Cult 57-minute isometric fitness regime opens up a downtown sweatbox. Why: Feel isolated from exercise? Isolate the muscles. When: Opens tomorrow. Daily, 7 a.m.-8 p.m. Where: 161 Sixth Ave., b/t Spring & Vandam Sts. (212-463-0570).