Today, Monday, Jan. 20, commemorates the birthday of the Rev. Martin Luther King Jr. This year, the holiday coincides with President-elect Donald Trump’s inauguration, though the majority of business closures will be for MLK Day.Major U.S. retailers and grocers – such as Target, Walmart and Kroger – will be open on MLK Day. Wholesale retailers Costco and Sam’s Club will also be open Monday. Most major restaurant chains will be serving food, but make sure to check with local stores and restaurants for their hours.Government offices are closed including banks and mail delivery.