you can find out about as much as I can just by searching online...and, I think that the studio I once went to for classes is possibly closed now, though the teacher may be teaching at some other studio. As well as yoga, he held Feldenkrais classes. Feldenkrais is great, I think -- and is good for -people who may not want to actually take a 'yoga' class or have any connection with anything called yoga, for whatever reason.
Oh, there are classes in Hudson through Assabet After Dark -- assabetafterdark.com, though, there may be similar types, closer to you, don't know.
I took some yoga classes there, too, from the same teacher who ran the yoga center. Now, there is a new teacher (took 2 classes from her, too).
Assabet is good -- though, I prefer now to go to night Adult Ed classes in Harvard, MA -- they cost less, since it's a smaller bunch of people. (Cooking classes, for me, now. Getting fat, shall need more yoga....)
I do think that Assabet asks a bit much for their night courses, but -- yikes -- I've checked out some prices of local yoga studios, and they are absolutely over the top!!! They must get some very elite people, but, no thanks, I am not that stupid, won't pay that much! . . . Assabet is in Marlborough, actually. But, right near Hudson.
I was curious about the Feldenkrais class at Assabet After Dark in Marlborough, and discovered that they're still doing it, and they just started a six week course last Monday. Details are at (new website). The price is incredibly cheap -- $11 per class. I have a friend who's been doing Feldenkrais therapy in Cambridge for several years now, and she swears by it.