Patriots’ Day is about as Massachusetts as it gets.

The April holiday is only celebrated by Massachusetts and Maine. It marks the first battle of the American Revolution, and has also become synonymous with the running of the Boston Marathon. The day is always commemorated on the third Monday of the month; this year, that’s April 20.

The unique holiday has a patchwork of schedule changes. Here’s what you need to know about what’s open and how to get around on Patriots’ Day.

Federal offices: Open. This day is only a big deal in Massachusetts.

Federal courts: Open.

Post offices: Open.

State offices: Closed.

RMV: Closed.

State courts: Closed.

Municipal offices: Closed.

Public schools: Closed.

Libraries: Closed.

Trash pickup: Check with your local government or provider. Trash and recycling will be delayed in some Boston neighborhoods. Boston residents can check for pickup delays by searching their address here.

Banks: Most banks will be open. It’s worth checking with your branch before heading out in case of altered hours.

Stock market: Open.

Retail locations: Open.

Liquor stores: Open.

Supermarkets: Open.

MBTA: The transit system will have a modified schedule, accommodating the Boston Marathon. The Charlie Service Center will be closed. See the full schedule here.

• T: Weekday schedule, however expect service adjustments. The MBTA’s guide will be updated here as the marathon gets closer. Copley Station will be closed for the day. South Street, Kent Street and Saint Mary’s Street stations will be closed from 10 a.m. to 6 p.m. No bikes are allowed on the T on Monday.
• Bus: Modified Saturday schedule.
• Commuter rail: Most lines will run a weekday schedule, but the Worcester Line will run a special marathon schedule. Check here for details.
• Ferry and The RIDE: Weekday schedule.