Possibly because England found it a lot easier to simply get rid of murderous Calvinists like Cromwell.
The thread is titled "Happy Guy Fawkes Day", not "Happy St Bartholomew Day". That was on August 22!
Related threads:
Protest Songs [review of "Les Huguenots", an opera about the St Bartholomew Massacre]
HISTORY OF THE HUGUENOTS
The Huguenots - their faith, history, and impact.
FOX'S BOOK OF MARTYRS, CHAPTER IV, Papal Persecutions