As Martin Luther King Jr. Day approaches, many are wondering about the status of various services and businesses on this federal holiday. The stock market will be closed, impacting trading hours for investors. Banks, post offices, and several businesses will also operate on adjusted schedules. Specific details on what is open and closed vary by region, affecting grocery stores, services like UPS and FedEx, and local events celebrating MLK Day. Communities are encouraged to check their local listings for the exact status of services like waste collection, schools, and holiday events.