LELA ROSE 224 W. 30th St., between Seventh and Eighth avenues; 212-947-9204 * Sale May 18-20. Wed., 9 a.m.-7 p.m./Thurs.-Fri., 9 a.m.-6 p.m. Spring runway frocks up to 80 percent off. YIGAL AZROUEL 225 W. 39th St., between Seventh and Eighth avenues * Sale...