I don't think it is the same
video as Blake found, but I found a video on you tube with some of the structures has mentions (and some other artifacts). The traditional house frame is a lovely dome (they hadn't clad this one with bark sheets).
https://youtu.be/gLl2PKtK_OQ
This seems to be a static display however rather than a gathering, but maybe they leave the projects behind after the gathering?
I also found
Ohketeau which is a cultural centre for the Nipmuc people. I don't know whether the event you watched was one of theirs ( I couldn't find the video you describe) but they do have workshops to promote skills such as brain tanning and traditional medicine. I found this one about making a canoe through burning:
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