I am not aware of Hillary's having attended these dinners, but it appears that her campaign manager, John Podesta, may likely have attended these events.
Nevertheless, it is hard to imagine that Hillary has no knowledge of these "dinners" given that she is highly familiar with "popular" and elitist New York society trends, which includes spirit cooking.
For those who do not know anything about "spirit cooking," it is a mystical "art" form created by Marina Abramovic, a woman who is deemed "artistic and unlimitless" by the likes of Lady Gaga and JayZ. (Look up, Lady Gaga praises Marina Abramovic on YouTube)
In any event, Marina's art consists of mixing together breast milk, sperm and blood. This mixture is what she uses to write on walls to express her beliefs such as "Cut deep into your finger and feel the pain" and other oddities.
Marina's dinners also share aphrodisiacs, which contain similar ingredients listed above and which are meant to be consumed. (You can find a picture of Lady Gaga taking a spoonful of the aphrodisiac online.)
Abramovic, according to her biography, claims to be heavily immersed in Communism and mysticism. Her teaching are more or less New Age, but with a sexual and violent emphasis. Thus, Hollywood entertainers and some politicians are "into her concepts." I suspect some of these politicians enjoy the sexual element of Abramovic's teachings, as well as the access this may give them to "spirit cooking" enthusiasts who are more than willing to endorse HRC, as well as provide entertainment for Clinton's fundraising dinners.
In any event, Abramovic is basically a "messed up" woman, who was abused as a child.
On one art showing occasion, she brought various weapons into her studio and asked people to do what they wanted to do with her, including shooting the loaded gun at her head.
The more you learn about the Clinton camp, the more you have to conclude that these people are indecent, to say the least.