The Sakharov Prize, awarded to Pakistani teenager Malala Yousafzai, is an honour awarded by the European Parliament.
Set up in 1988, it is designed to honour "exceptional" people who show courage in defending human rights and freedom of expression.
More top news
Janet Ajao said in a statement: "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."
Sonia Bryce played 'Shape of You' at top volume and cause a "wholly unacceptable level of disturbance" according to a judge.
They will be joined by Duke Dumont and Disciples at this year's festival in Staffordshire.