DUSSELDORF, GERMANY— Drupa still on. As fears over the coronavirus sweep the world, causing cancellations of major events in affected areas,  drupa says it is all systems go for the June 16-26 event, with no plans to cancel. The drupa location, Messe Düsseldorf, has just postponed half-a-dozen shows scheduled to run in March. Drupa is the biggest trade show hosted at Messe Dusseldorf, occupying all 18 halls, and is the biggest event by far in the global print industry. It has never been cancelled, although it did switch from its four-year cycle to five years in the 1990s, so it could run in the year 2000. Drupa is expected to  attract upwards of 250,000 visitors to the booths of 2000 exhibitors .