Montreal Museum Day is a day when the public can enter many museums free of charge. There are also free buses that transport people from one museum to another and each bus has a predefined circuit. You can go down and get into when you want at the museum of your choice. The departures and arrivals of the circuits take place at the Promenade des Artistes in the Quartier de Spectacles. The day begins at 9:00 am and finishes around 5:00 pm or 6:00 pm, depending on the closure of museums.
You can take the metro and disembark at Place-des-Arts station and take the Jeanne-Mance exit.
Check the site to get a list of museums to visit. This year, there are 43 museums participating in this special day.
Keep in mind that some museums are more in demand than others, so you can check out tat he information center or ask to the drivers to find out who has fewer people or easier access.