We wouldn't normally use this space for a show opening next weekend, but this is a limited run that may sell out early. The Dragons' Trilogy is a sprawling six-hour epic that covers 76 years in the lives of two sisters in Canada along with glimpses of French- and Chinese-Canadian cultures. Yet this marvelous work, created by director Robert LePage and several actors from Quebec's Theatre Repere, is perfectly lucid, infused with enough drama and style to make each moment engrossing. The highlight of the 1990 Chicago International Theatre Festival, Dragon's Trilogy is returning for six performances that will once again take place on ten tons of sand spread across the stage of the UIC Theater. On this humble foundation, the set and lighting designers conjure an array of locales including a dingy laundry in Quebec's Chinatown, a train taking a young woman to a wartime military base in Ontario, and an art gallery in contemporary Vancouver. And with infinite invention, the actors provide a show that is exotic, beguiling, and beautiful--everything an international theater festival should be. At the UIC Theater, 1040 W. Harrison, May 19 and 30 and June 5 and 6 at 5PM; the performances on May 31 and June 7 are sold out. The $60 ticket includes dinner. Call 664-3378.