Some communities build small, recurring rituals specifically around kindness: a street where neighbours leave surplus vegetables on a common table, a roster for checking on elderly residents living alone, a simple tradition of introducing new arrivals to a handful of nearby households soon after they move in. None of these require much organisation to begin.
What keeps a ritual like this alive past its first enthusiastic month is repetition built into a schedule rather than left to spontaneous goodwill, since goodwill alone tends to fade once the initial novelty wears off and everyday busyness reasserts itself over the following weeks and months.
Over time, a kindness ritual repeated often enough stops feeling like an effort and starts feeling like simply how the street operates, which is usually the point at which it has genuinely become part of a neighbourhood's culture rather than a project someone is still actively running. That small shift in framing tends to matter more, in practice, than it first appears to.