FOREFATHERS’ DAY 2020. To carrying this old tradition in the Colony Club of Plymouth, Massachusetts, introduced the observance in 1769 and This town observes on December 23rd with several events ,The Old Colony Club and the Mayflower Society both include a succotash dinner as part of their celebration. Well into the 1800s from New England to Los Angeles, churches and other organizations celebrated the day with meals they called “New England” dinners.in the history and as per the Gregorian calendar The largest Forefathers’ Day celebration took place in 1920 when President Woodrow Wilson proclaimed the day as Pilgrims’ Day on December 21st.