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Nagoya has standard Magic tournaments almost every day.
-- MONDAY: Card Brunch Kanayama, 6:30
-- TUESDAY: Hobby Station Sasashima, 6:45 pm
-- WEDNESDAY: Hobby Station Mei Eki, 6pm
-- THURSDAY: TCG 193, 7pm
-- FRIDAY: 6pm, FNM, Various locations (check MTG locator), Draft at Big Magic usually if enough people. Prinny Club Kanayama 8pm and 11pm.
-- SATURDAY: Card Labo Mei Eki, 11:30 am - Hobby Station Mei Eki, 2pm.
-- SUNDAY: Big Magic, 11 am. Usually a booster draft after standard tournament (3:30 or later depending on number of participants at the standard event).
There are also Legacy and Modern events held around town during the week.
There are also modern, legacy, and vintage events about one time a month at Big Magic as well. Amenity Dream also hosts one Legacy even a month too I think. Check the "Magic the Gathering" tab on the top of my website to get more information about the locations of these stores.