The posters inviting people to a conference announced that at the conference everyone would be encouraged to use expletives. At the conference, when the conference's participants began using expletives most people were shocked.

However, using them everyone was able to define and comprehend and analyze the problem better, and propose better solutions than if no one had expressed themselves without using expletives.
After the meeting, the participants laughed and began talking among themselves using expletives such as "shit," "bullshit," "fuck," and its many derivatives.

The most common way expletives are destigmatized is by allowing and encouraging people to in private or public meetings use words which are considered "dirty" or "bad", such "shit" and "fuck".

In what events would it be best to allow people to use of expletives, and to achieve what?
The First Amendment is "also" about the right to be despicable, or to be anything.
Expletive Destigmatization means allowing, encouraging, and not penalizing anyone for using, in a private or public meeting, words considered to be "dirty" or "bad", such "shit" and "fuck".

"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"