Fluxus Happenings

I'm constantly asking myself the question "What is art?" and I'm just generally interested in any art that asks the same thing.
Since I'm struggling with the concept of a dinner party as a sculpture installation (and it's taken a very psychology-based turn recently), I did some research on Fluxus happenings and their blurred art-social structure.

They were frequently performance-based and often required the participation of a spectator. They evoked gestures and actions constituted from an individual's everyday experience. In a way it's considered anti-art, but it could also be considered as a boundless form of art.

Fluxus Art Amusement: Manifesto by George Maciunas


Cut Piece by Yoko Ono:

and WOW this is so perfect for my research:
Eat Art by Daniel Spoerri: