Why? Generally languages cannot be controlled. Small changes can sometimes propagate through prescriptivism, but only then with some substantial support via standardization, and over the course of one or more generations, not individual years. I can imagine what you describe, but I can't think of it actually occurring.

Languages can change rapidly through contact. Languages can also be suppressed (by teaching children another language and punishing them for speaking their own). Speakers can be killed, and languages along with them. But all of this takes place on the scale of a generation or more, and it's not something that anyone has ever controlled to the level of changes to individual sounds in any general way. Languages, if speakers continue speaking them, are resilient.

The closest thing I can think of is extreme cases of taboo where in some societies for example the name of a recently deceased person might be avoided, and again in the most extreme cases sometimes a particular phoneme from that name, which could potentially result in a long term change in the language. So you could look into some research on the topic of taboo. What is crucial there, though, is that the speakers are willing participants in avoiding that name (or sound), and that also correlates with this being an important and unusual event, not just something that happens every year because it's on the calendar.