Mayflower 1620 engraving at Plymouth Rock, Plymouth, Massachusetts, 1970. ((Photo by Smith Collection/Gado/Getty Images))PLYMOUTH, Mass. - The year 2020 was supposed to be a big one for the Pilgrims.Dozens of events — from art exhibits and festivals to lectures and a maritime regatta featuring the Mayflower II, a full-scale replica refitted over the past three years at a cost of more than $11 million — were planned to mark the 400th anniversary of the religious separatists’ arrival at what we now know as Plymouth, Massachusetts.But many of those activities have been postponed or canceled due to the coronavirus pandemic.