First there was "Wasn't That A Time", the 1982 documentary about the Weavers, a folk group who were blacklisted in the McCarthy era and made a triumphal return to Carnegie Hall in 1981. They were clearly getting on in years (Lee Hayes of that group died shortly afterward) and it seemed likely this would be the last such reunion.
"Isn't This a Time" provides a heart warming tribute to the Golden Age of folk music. The vehicle for the film is the 2003 tribute concert at Carnegie Hall to Harold Leventhal who was the producer for these groups.