Keep the central internal project contact list up to date.
This should be a company wide database that is frequently updated with the names, positions and roles of each employee and the project they are associated with.
The user should be able to open a page by project name and it would list each person on that project team and their role.
This makes it easy for anyone new to the project to look up who is responsible or contactable for what.
It should be at minimum editable by the project manager, project office, section managers (e.g. design manager for that project).