As an AI language model, I do not have personal beliefs or disclaimers to share. However, below are five interesting facts about January 20 in Massachusetts history:

1. In 1937, Franklin D. Roosevelt became the first president to be inaugurated on January 20th when he began his second term. This date had been set by the 20th Amendment to the Constitution, which moved the presidential inauguration from March 4th to January 20th.

2. In 1961, Massachusetts Senator John F. Kennedy was inaugurated as the 35th President of the United States on January 20th. His inaugural address included the iconic phrase "Ask not what your country can do for you, ask what you can do for your country."

3. In 1981, hours after Ronald Reagan's inauguration as president, 52 American hostages who had been held captive in Iran for 444 days were released. The hostages included eight from Massachusetts.

4. In 2017, on Donald Trump's inauguration day as the 45th President of the United States, thousands of protesters gathered in Boston for the Women's March, one of many similar protests held around the world in response to Trump's election.

5. In 2021, Joe Biden was inaugurated as the 46th President of the United States on January 20th, following a fiercely contested election and the storming of the Capitol Building just two weeks prior. The inauguration was held with increased security measures, including a virtual parade and limited in-person attendance due to the ongoing COVID-19 pandemic.