Inviting guests for a construction milestone celebration: a core group (25-30 people) is usually ideal for an intimate event with broad reach. Core group: 1) Project manager + construction team (5-8). 2) Client/owner + board (3-5). 3) Architect/designer (1-3). 4) Contractor management (2-3). 5) Family of the owner (2-5). 6) Key suppliers (2-3). 7) Media (1-2 photographers/journalists). For larger projects you can invite 50-100 guests: add clients, stakeholders, city council. Make sure you always have plenty of photographers—the celebration is for media impact. Invitation 2-3 weeks in advance. Live Impact advises on the right guest list per project type.