How to Meet and Mingle in the '90s The most astonishing people have significant others. The boorish, the ugly, the unrefined, the pushy, the dull... so often persons one might otherwise pity as of the dregs are quite happily hooked up with perfectly normal mates. If you find yourself -- your intelligent, attractive, professional with a sense of humor self -- unhappily alone, there is still perhaps hope. Kelly Howard may be able to help you. She claims that her seminar will help you find the love of your life, or at least someone to date. The author of Single Smart (those obsessed with the idea of couples might note how well the words "single" and "smart" work together) speaks 7-9 p.m. Holiday Inn Crown Plaza, 2222 West Loop South. Call Together, the nation's oldest dating service, for details. 621-7788.