Conversation so far:
What happened regarding Blonde on Blonde on February 15?
On February 15 the session began at 6 p.m. but Dylan simply sat in the studio working on his lyrics while the musicians played cards, napped and chatted.
When was Nashville's first recording session for Blonde on Blonde?
The first recording session in Nashville took place February 14–17.
Did Bob Johnston remove the baffles?
At Dylan's request, Johnston removed the baffles.

Question: what happened in 1966?
Self-contained rewrite: what happened regarding Blonde on Blonde in 1966?