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Green Man Festival has remained silent over whether it plans to axe the group Kneecap from this year's line-up.
The Welsh government said it "unequivocally condemn calls for violence against any group or individual" and the festival should consider "whether it is appropriate for the act to perform".
The west Belfast rap trio are set to perform at the festival, held near Crickhowell, Powys, in August.
The group have the support of several artists with ties to the festival who have signed an open letter calling for artists to have freedom of expression but, despite repeated requests from the BBC, Green Man Festival has not commented.
