A performance by Simone Forti is rare and precious. The 77-year-old dancer, choreographer, artist, and writer is based in Los Angeles. She is a renowned practitioner of improvisation, having discovered the discipline in the late 1950s. In her career, Forti tried different dance techniques such as Graham and Cunningham before she became aware that dance could be conceptual: “We didn’t have to dance on a stage; we didn’t have to leap; we didn’t have to wear certain kinds of costumes. We were artists, working in the medium of movement.” She’s still at it. Festival Fabbrica Europa, tel. 0552638480, www.fabbricaeuropa.net.