This ambitious, extensively researched exhibition, “Beuys Brock Vostell,” curated by Peter Weibel with Eckhart Gillen, takes as its starting point several collective actions in which Joseph Beuys, Bazon Brock, and Wolf Vostell participated. These include the international Fluxus Festival der Neuen Kunst (Festival of New Art) in Aachen, Germany, in July 1964, a pioneering live television broadcast from Düsseldorf in December of the same year, and finally the Happening 24 Stunden (24 Hours) at Galerie Parnass in Wuppertal, Germany, in June 1965, which also included Charlotte Moorman, Nam June