Neighborhoods interested in pursing a paint the pavement project should begin by reading the Paint the Pavement Packet (linked at the bottom of this page). It outlines the process required to obtain city approval to paint a mural in a public right-of-way.
Included are the Paint the Pavement Installation Agreement, which authorizes the mural and deems it art rather than graffiti, and the Block Party to Paint the Pavement Permit Application, which is the most likely mechanism for closing the street segment for installing the mural. Depending on the timing of the proposed Block Party to Paint the Pavement, you may be able to apply for funding from the City of Boulder's Neighborhood Connection Fund to pay for things like snacks, refreshments, entertainment, etc. For more information on the Neighborhood Connection Fund and to submit an application, visit the program website here.