ocr: FOREIGN IMPORTS Revelers twist and shout at the Madhatters Party, an AIDS fund- raising event let loose in the neighborhood of Lan Kwai Fong, hangout of the young expatriate set. For many: old-timers, however, China has crashed Hong Kong's party, triggering a large-scale exodus. Still, the number of foreign-born residents is climb- ing, many of them working-class British youths in search of jobs. If1 they get home- sick, they can always watch the locals bowl (below) att the Kowloon Cricket Club.