Pre-Moms Day Party LA What: Share champagne and cupcakes while you and your mom custom-design something special with Bare Jewelry. Why: Shes a good mama jama. When: Sat., 2-5 p.m. Where: Des Kohan, 671 Cloverdale Ave., b/t Wilshire Blvd. & 6th St., Miracle Mile (323-857-0200). R.S.V.P. to email@example.com. Traffic Warehouse Sale What: Clothing and accessories by Chloe, Twelfth Street by Cynthia Vincent, Kooba, and such up to 70 percent off. Why: Rubbernecking allowed. When: Sat. & Sun., 9 a.m.-4 p.m. Where: 920 N. Formosa Ave., b/t Santa Monica Blvd. & Willoughby Ave., West Hollywood (323-969-1962). Marc by Marc Jacobs Store Opens San fran What: Pretty prints and lovely bags give you one more reason to make a trip to Fillmore Street. Why: On your Marc, get set, go. When: Today. Where: 2142 Fillmore St., at Sacramento St. (415-447-9322). Black Images Book Bazaar Dallas What: Independent store carries an expansive selection of African-American tomes. Why: The only ones who know how to read you. When: Mon.-Sat., 10 a.m.-7 p.m. Where: 230 Wynnewood Village, Oak Cliff (214-943-0142). Kentucky Derby Event Chicago What: Complimentary mint juleps and a 15 percent discount for customers in hats. Why: Sombreros welcome. When: Sat., 1-7 p.m. Where: Koros, 1019 W. Lake St., b/t Carpenter & Morgan Sts. (312-738-0155). Treasure Hunt Sample SaleWhat: Merchandise Mart showrooms slash prices up to 70 percent. Why: Put down the cerveza and shop. When: Sat., 10 a.m.-5 p.m.; Sun., 11 a.m.-5 p.m. Where: Merchandise Mart Design Center, at Kinzie & Wells Sts., 7th flr. (312-527-4141). Knoll Studio Sale Boston What: Chic, ultra-modern pieces (nearly half off) from super-cool ecological furniture designer. Why: Have a seat. When: Mon.-Fri., 10 a.m.-6 p.m.; Sat., 11 a.m.-5 p.m. May 5- 12.Where: Showroom, 240 Stuart St. (617-482-4805). Luxury Trunk Show at Nine Zero What: Ogle everything from Michelle Reveres home collection to Loro Piano cashmere. Why: Live well, be well. When: Thurs.-Sat., 11 a.m.-7 p.m. Where: 90 Tremont St. (617-772-5800). Designer Jewelry Trunk Show What: Various discounts on summer jewelry from the likes of Damiani, Furrer-Jacot, Tycoon Cut, Piero Milano, Peter Storm, and Henry Designs. Why: Your shining moment. When: Sat., noon-4 p.m. Where: Alpha Omega, Natick Mall, 1245 Worcester Rd., Natick (508-655-0700) Spring Shopping Night Washington DC What: Champagne and 25 percent off Phillip Lim, Nicholas K, Rozae Nichols, and John Varvatos. Why: Youre hot to trot. When: Thurs., 4-8 p.m. Where: Muléh, 1831 14th St. NW, b/t S & T Sts. (202-667-3440).