Mariposa Salon & Spa (3700 Orleans Ave., Suite D, 484-0440; hosts Blowout for Cancer, a fundraising class and mixer for the American Cancer Society, on Thursday, Oct. 21 from 6 p.m. to 8 p.m. Guests will learn professional blow-drying techniques and receive prizes, complimentary food and wine. Admission is $20.

Blue Nile (532 Frenchmen St., 948-2583; hosts the 15th Annual NOLA Designer Halloween Costume Boo-tique on Saturday, Oct. 23 from noon until 5 p.m. featuring one-of-a-kind costumes, masks, accessories, props and more. Free admission.

The Delgado Community College Horticulture department (615 City Park Ave., 671-5000; club GrowthWorks holds a fall plant sale Thursday, Oct. 21, and Friday, Oct. 22 from 9 a.m. to 3 p.m. at the Delgado City Park Campus' Horticulture Greenhouse. Proceeds benefit the horticulture program. Contact Rich Gillen at 671-6316 for more information.

Friends of the Jefferson Public Library hosts the Big Book Sale Oct. 21-23 from 10 a.m. to 8 p.m. and Sunday, Oct. 24, from noon to 5 p.m. at the Pontchartrain Center (4545 Williams Blvd., Kenner, 465-9985; More than 80,000 used books, CDs, DVDs, tapes and records will be available. Admission and parking are free.

Saks Fifth Avenue (The Shops at Canal Place, 301 Canal St., 524-2200; hosts Key to the Cure, a charity shopping weekend during which Saks will donate 2 percent of all sales to research programs at the Louisiana Cancer Research Consortium. The event runs Oct. 21-24 and will begin with a gala Oct. 20 from 6 p.m. to 9 p.m. Gala admission is $50, and all proceeds benefit the charity's fund. Food, beverages and entertainment will be provided.