Create a campaign to target only managed placements and have a single ad group that contains all of these placements. Create a campaign with the same settings, but have multiple ad groups with keyword themes and set them to target these placements, creating an Enhanced Online Campaign. For example, if you have a cosmetics client, you might want to have a few ad groups with themes like “makeup”, “hair products”, “ cosmetics”, etc. Then, targeting these Black Friday placements, you will be in a better position to place ads in front of consumers looking for deals around products your client sells.