If you are looking for other types of Historical European Martial Arts in the greater Portland area, here are a few other clubs, groups, and organizations that you can look into:
A group focusing on the historical martial arts of medieval and renaissance Italy.
The Cateran Society
A group focusing on the Martial Arts of Scotland.
The Blade Society
A group run through the University of Southern Maine. If you are interested in joining the SCA, they can also help you.
Portland Fencing Center
The Portland Fencing Center is not a HEMA group, but if you are more interested in Sport Fencing, they are your best option.