The Chautauqua adult education movement flourished in the late 19th and early 20th centuries, then declined. However, some Independent Chautauquas still operate today, and these are the 21st century Chautauquas. They are divided into two categories, Continuously Operating Chautauquas and Revival Chautauquas.
All references agree that at least these four Chautauquas have continued operations, without missing a year, from the heyday of the Chautauqua Movement (1920s or earlier) into the 21st Century:
Chautauqua Institution (the original Chautauqua in New York State).
Lakeside Chautauqua in Lakeside, Ohio
Monteagle Sunday School Assembly in Monteagle, Tennessee
Colorado Chautauqua in Boulder, Colorado
In addition, several other entities self-report that their activities constitute Continuously Operating Chautauquas:
Bay View Association in Bay View, Michigan
State of New Mexico Chautauqua program, operated by NM Humanities Council
Martha's Vineyard Camp Meeting Association in Oak Bluffs, Massachusetts
Ocean Grove Camp Meeting Association in Ocean Grove, New Jersey
Miami Valley Chautauqua Association in Miamisburg, Ohio
Fountain Park Chautauqua in Fountain Park, Indiana
Ocean Park Association in Ocean Park, Maine
Pennsylvania Chautauqua in Mt. Gretna, Pennsylvania
various other Sunday School Assemblies
Some other organizations have honored the Chautauqua tradition by starting (or restarting) similar operations in the late 20th and early 21st centuries. Examples include the following:
Lake Superior Big Top Chautauqua near Bayfield, WI Bayfield, WI
Chautauqua-by-the-Sea at Ocean Park, Old Orchard Beach, Maine
The annual Chautauqua Festival held in Wytheville, Virginia since 1985
Chautauqua Andrews Valley Experience in Andrews, North Carolina
The Florida Chautauqua Assembly held in DeFuniak Springs, Florida since 1996
The New Piasa Chautauqua in Chautauqua, Illinois
The Waxahachie Chautauqua held in Waxahachie, Texas since 2000
The New Old Time Chautauqua touring the Pacific Northwest since 1981