All placemaking projects located in (and sometimes near) the street will require some kind of traffic control to keep you and your neighborhood volunteers safe during installation. City staff will help you understand what is required for this. Most placemaking projects can be accomplished as part of a neighborhood block party. Find out how to request closure of a street or intersection for a block party on the city's special event permit page.
If your placemaking project covers more than a single block or intersection, then you may need to apply for a special event permit instead.
Keep in mind, on busier streets (thoroughfares) and at signalized intersections you may be required to hire an off-duty police officer(s) to provide traffic control during the installation of your project. That can create additional expense for the applicant.