Final answer:
A session that discusses plans, team formation, roles, and project expectations is known as a Project Kickoff Meeting.
Step-by-step explanation:
The session described appears to be a Project Kickoff Meeting. This is a gathering that typically takes place at the beginning of a project.
Its main purpose is to share the plan, discuss team formation, assign roles and responsibilities, establish expectations and the project climate, anticipate outcomes, and plan for likely contingencies.
It also serves as a platform for gaining buy-in from all project stakeholders, ensuring that everyone is aligned with the project's objectives and understands their role in its execution.