As the titles says tomorrow, Sep 15th, Tomioka Hachiman Shrine Antique Market will be held from 8am to 3pm.
The market is held inside the grounds of Tomioka Hachiman Shrine which is a 4 minute walk from Tozai line Monzen nakacho station. There are many stalls selling all kinds of things so I am sure you will find something you love at a great price. I suggest you arrive no latter than 1pm as I arrived one time a little past 2 pm and most dealers were already gone but maybe as it a little cooler they might stay a bit longer.
https://www.fukagawa-kanko.com/en/tourist/antique/
https://antique-leaves.com/?pid=174802117
Also a bonus is walking from the station you will pass a large Buddhist temple called Naritasan Fukagawa Fudōdō Temple if you interested.
https://tokyo-park.net/naritasan-fukagawa-fudodo-temple/
Hope you make it and have fun!!
by Hinas_For_Life