Yes, most of the shops are open on Sundays. But the shops on the street closes early each day. By 6pm the street is very quiet.
This kappa bridge shopping street
Because each place is gathered
Regular holiday etc for each shop will be this.
If there are shops and tools that you would like to visit
Because there is HP of the shopping district,
I recommend you to see there.
(At least the New Year's Holiday, Obon holiday
From August 10th to 20th there will be shops sitting irregularly)
Get quick answers from Kitchen Town (Kappabashi) staff and past visitors.