Hello @jmonroe,
ProfileGrid extension “Frontend Group Creator” allows user to create the group from front end and administrator may enable the settings to make that user group manager of created group. For more information on this extension, please visit the link: https://profilegrid.co/create-new-wordpress-groups/
Once user becomes Group Manager, he may invite other users to join group using the extension “Advances group Manager” from front end. For more information on this extension, please visit the link:https://profilegrid.co/multi-group-users-and-group-manager/
ProfileGrid extension “Group Wall” adds the social activity to your groups. Group members can create new posts, comment on other users’ posts and browse Group timeline. Group Wall is accessible from Group page as a new tab. For more details, please visit the link: https://profilegrid.co/how-allow-user-to-submit-post-and-upload-media-to-their-group-walls/
I hope this helps, let us know if you have any other questions.