I have mixed feelings about community gardens. I've only seen them work well in religious communities and prisons: where volunteers are more-or-less conscripted to help out... It has been my
experience in other settings, that the head gardener ends up doing just about all of the work, and the other gardeners just take food. Volunteers from the community are notoriously bad about weeding, and
irrigation, and picking. It often takes longer to pick a crop with 10 volunteers helping than it takes for one experienced farmer to pick the same amount of produce. And the quality of work is much higher if people-off-the-street are not allowed to work in the vegetable garden. Even when the garden could really use those 10 volunteers, it's hard to get help. Farming is hard work. Few people in today's world have the physical strength, observation skills, or decision making ability to volunteer successfully at a community garden even if they wanted to.
Sometimes, the right combination of volunteers works well together, and enjoys each others company. It's wonderful when it works out. People are fickle, and move away, or have kids, or change jobs, or get in spats, and the magic disappears, then the head gardener is all alone again.
The subdivided field is a common strategy. It runs into problems with pesticide users vs non-poisoners. Plots generate (weed) seeds that contaminate other plots. Pollen doesn't respect boundaries. Irrigation and work schedules may be in conflict. The rain falls on the good and the bad. So do the blights, and the rots, and the bugs, and the hail. Some of those can be blamed on other gardeners... In this scenario, at least give the same person the same plot every year, so that the efforts they put into soil fertility and weeding are not wasted.