The Martin Luther King Jr. holiday will be observed on Monday, Jan. 21. 

Here's a run down of what's open/closed:

All municipal, state and federal offices and facilities will be closed. This includes schools and the post office. 

All MBTA buses and trains will running on a reduced weekend/holiday schedule. 

Liquor stores: Open at the owner's discretion.

Retail and convenience stores: Open at the owner's discretion. 

Restaurants and bars: Most will be open, but call ahead. It's up to the owner. 

Enjoy the day if you have it off!