The city will convene a meeting tonight (Aug. 1) to discuss the proposed re-use of the former Mattapan Library branch on Hazleton Street in Mattapan. The meeting will be held from 6-7 p.m. at the new library branch at 1350 Blue Hill Ave. The Boys and Girls Clubs of Boston will present a proposal to re-use the 13,700 square foot building. The city of Boston’s Department of Neighborhood Development put out a request for proposals to re-use the property earlier this year. The Boys and Girls Clubs of Boston was the only group to submit a proposal.