Is it historically true that there was a debate where Calvin persuaded 200 catholic...

[whirlingmerc]

...priests? The issue was transubstantiation
The bedate was to last a week
After 4 days Calvin spoke and it was over

This was the description in the biographical book "The Betrayal: a novel of John Calvin" How historic is that claim

 

[David]

At the end of the bedate he came up with a magic potion to make them believe..and slipped them a mickey.

 

[PaulCyp]

Note the word "novel". That means "fiction".