Yes - you can create ‘Groups’ of contacts in your address book. A group can contain up to 2,500 email contacts, which is the limit of our online address book. By sorting your contacts into Groups, you can quickly address an invitation to many people with a single click.
There are no limits to how many different Groups you can create, and the same individual can be assigned to multiple Groups. There are also no limits to how many invitations you can send or how many people you can have on your guest list.