One of the year’s most glamorous gatherings in Boston is the next casualty of the coronavirus pandemic.

The massive Ace Comic Con entertainment convention, which features A-list movie stars like Chris Evans and Tom Hiddleston and was expected to attract more than 30,000 fans to the Boston convention center, has been postponed. Organizers said they are working with the Massachusetts Convention Center Authority on finding a new date.

Organizers said the declaration of an emergency in Massachusetts by Governor Charlie Baker on Tuesday left little choice but to postpone. “We feel for anyone and everyone affected by the Covid-19 virus,” the organizers said in a statement, adding that they would try to provide full refunds within 30 days.

Scheduled for March 20-22, Comic Con is the biggest of several trade shows and conventions that the MCCA had scrambled to reschedule, following the rapid increase in cases, now up to 95 in Massachusetts, and the emergency declaration by Baker.

Several major events scheduled for March had already been scratched. A global seafood expo scheduled for next week was canceled, and on Tuesday the NECANN Boston cannabis convention announced a postponement, with the Massachusetts Restaurant Association’s annual New England Food Show following suit on Wednesday. A gathering of scientists and physicians who specialize in viruses scheduled for this week was moved to an online convention.

Multiple major and smaller events around the country have been postponed; on Wednesday the National Collegiate Athletic Association said the March Madness basketball tournament will be played in arenas without spectators.

Meanwhile, the MCCA is contacting the organizers of all events scheduled for the next 30 days, in an effort to shift them to later dates. It’s a challenge, MCCA spokesman Nate Little said, because April through October is the busiest time for conventions, so most of the good slots are already taken.

“We’re having some difficult conversations with everyone involved," Little said. “We’re going to reach a mutual decision that works for everybody."

Some of the upcoming events are relatively small. But the Boston Marathon Expo, set for April 17-19, is supposed to draw 10,000 visitors, and the New England Anime Society show is expected to attract more than 25,000 fans of Japanese cartoons and comic books April 10-12. On Tuesday, Baker said state and local officials were still discussing whether to hold the Boston Marathon next month.

This could be just the beginning of a long and ugly process, since there’s no telling how long the emergency will persist. The MCCA said it’s preparing to reschedule or cancel another 30 days’ worth of meetings if the coronavirus threat lingers.