Next weekend is the Asagaya Morning Market (“Asaichi” or 朝市）on Shouwakai, one of the smaller shotengai just north of Asagaya Station. It’s a small street market with the shotengai shopkeepers as vendors, with everything from second goods to and locally grown food.
There is also a Hawaiian Fest component this year taking place at the shrine across the street (Nakasugidori).
The event is Sunday, June 28th from 11am to 5pm.
You can find more information on the official Shouwakai website (in Japanese).