Have no idea about the Festival or the "stars" taking part but thought I would post to add to the list of those challenging the EHRC guidelines.
The festival faced controversy yesterday (May 27) when British artist NOAHFINNCE claimed that the Leicestershire festival was adhering to government guidance that would stop trans people from using the toilet facilities that corresponded with their own gender identity.
A screenshot shared by NOAHFINNCE seemingly showed the festival’s response to an email which stated that it was looking to “promote the safety and comfort of all festival attendees including transgender and non-binary customers”, but would also be “following the interim guidance issued by the Equalities and Human Rights Commission (EHRC)”. The aforementioned EHRC guidance states that “trans women (biological men) should not be permitted to use the women’s facilities and trans men (biological women) should not be permitted to use the men’s facilities.”
https://www.rollingstone.co.uk/music/news/download-festival-responds-after-questions-raised-over-trans-toilets-50547/