"Harvey had to do chalitsa last week for Rachel." (Glinert)

"I’ve personally witnessed a khalitzah ceremony, back when I was in a religious school. They took the entire school out from class to see it, because it’s a fairly rare occurrence." (source)

"What should a woman who can only do Chalitza do if her Yevam can't do it?" (source)

"In any event, even chalitza is rather rare today, for Baruch Hashem, technology can solve more than 90% of the fertility problems in couples, not to mention the vast majority who don't have problems conceiving, and the non-religious couples who usually don't get married until they want children." (source)