If you only want to involve a certain group of participants, you can mark a participation project as private and invite the participants by e-mail. This is ideal for participation within committees or organizations, for example. Private projects are only visible to invited participants and are marked as private projects in the overview of projects on the organization page.
You can set your project to “private” in the project's basic settings. As soon as the project has been published, the menu item “Participants” will appear in the left navigation in private projects. Invited participants will receive an automated e-mail asking them to register on adhocracy.plus and join the project. In the dashboard you can see who has registered and which invitations are still pending.