Ursula Biemann, Nicolas Bourriaud, and others said they will no longer participate in the event.
The artist also called for a boycott of the Havana Biennial.
Cuban artist Hamlet Lavastida was released from prison in Havana and exiled to Poland along with writer Katherine Bisquet.
Artist Luis Manuel Otero Alcántara is set to be transferred to the Guanajay maximum security prison, facing charges of contempt, resistance, and assault.
Over 140 artists and intellectuals including Tania Bruguera and Katherine Bisquet have voiced their support for Hamlet Lavastida.
The bipartisan group of politicians urges the release of Denis Solís, a rapper arbitrarily detained last year, and expresses solidarity with the San Isidro Movement artist-activist collective.
The motion was filed on behalf of 1,252 artists, and counting, who signed a petition in its favor, including artists Tania Bruguera and Sandra Ceballos.
“We must use the right definitions: KIDNAPPING,” said Deborah Bruguera, the artist-activist’s sister.