Where can I get 120 format film developed?”
I think if you took a little time to look near you, you would be surprised as to how many do still develop 120mm film. First, don’t even bother asking one hour places. Your best bet would be a pro shop that deals with wedding photographers. You could probably even call a local wedding photographer and ask them. Even if they have switched to digital, they would at least know where you can get it done. Even if you can’t find a convenient local developer, there are many that you could mail it. I put some below. Also, a Holga is a fun way to really get into photography. You may want to consider enhancing that experience by getting into developing your own film. There are a tone of recourses for doing just that. No matter which way you go, have fun. Enjoy the camera. I hope it opens your eyes to a new world of photography.