Conversation so far:
What were beginning years like for the band?
The Nitty Gritty Dirt Band was founded around 1966 in Long Beach, California.
Who were the founding members of the band?
singer-guitarist Jeff Hanna and singer-songwriter guitarist Bruce Kunkel.
What was the genre or style of music they chose to play?
started as a jug band and adopted the burgeoning southern California folk rock musical style.
What album did they release during this period?
CANNOTANSWER.

Question: Were there any significant performances during this period?
Self-contained rewrite: Were there any significant performances by the Nitty Gritty Dirt Band during the period of 1966-1969?