The city is seeking public input as it attempts to shape the future of the downtown. On Tuesday, city officials are holding the third of three public meetings to discuss a downtown economic development plan that is in the works. The session will be held at 6 p.m. at the South Branch Library, 78 Lynn St. Prior meetings have focused on specific aspects of the plan. Tuesday’s meeting will look at “the larger vision,” according to Blair Haney, Peabody’s assistant director of planning. There will also be a discussion of the results of a recent online survey the city conducted in which participants were asked to rate images of current and potential types of building use and design, streetscape features, and other visual facets of the area. The city received more than 260 survey responses. Public input will help the city’s consultants develop recommendations for the plan, according to Haney. He said when those recommendations are complete, the consultants will present them to the City Council and the mayor at a public meeting, probably in late November or early December.