Hi @Min_Yu and @Daniela_Barbosa,
Currently, we can include committees and invite individual members to meetings using project control center.
As is there is no functionality to include mailing lists as invitees for meetings but we can include the members individually.
Also regarding your third point, I believe including group members would serve very useful for larger groups that are not connected to a committee.
This would definitely be something we should include in the Feedback for next iteration of committee/project user management - #13 by emsearcy discussion.
You can use meeting management to invite any member of your community as long as they have an LFID.
@emsearcy, or @ProdMgrs do you know if there is any current workaround for inviting 280+ members associated to a mailing list using meeting management?