Found numerous tourism references to them in Schenectady County, NY.
From
http://www.johnnymilleradventures.com/cserie.htm"Nature Walk and Museum Tour
* Sat 10 am-12pm, Sun 2pm-4pm
* Donations Accepted, Rotterdam Junction
* American and Cultural Center and Museum
* Native Keepers Of the Circle Inc, (518) 371-6582
* vljphd@nycap.rr.com
* Description: Guided nature walk to explore the flora and fauna along the Canal and Tour of the on site Museum. Stories will be told about history of this area and Native American Customs.
* Driving directions: Exit 26 Proceed west on Rt 5S approximately 2 miles on the right.
* Group size max: 12-15
* Handicap: Yes
* Pre registration: Yes
* Gear: Good walking shoes"
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From
http://www.parkerinn.com/schenectady-attractions.htm"Situated on a 29-acre site on the South bank of the Mohawk River in Rotterdam Junction. The center presently houses a museum, gift shop and classrooms to educate the public about American Indian culture, languages, arts and crafts. Future plans for the Center include a nature trail, boat dock, an American Indian Restaurant and an open-air theater. (518) 887-2590
http://www.keepersofthecircle.com"
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The keepersofthecircle website goes to a registrar page.