You can submit a request for a Group here: http://bit.ly/carousellgroups
We receive a high volume of Group creation requests from the community on a daily basis hence it may take awhile before our team gets to your request.
That said, Groups that are requested for by more users stand a higher chance of being created! Therefore, if you really want your requested Group to be created, ask your friends or other like-minded Carousellers to request for the Group too!
Do keep a lookout as we are continuing to create more Groups :)