Liam Óg Ó hAnnaidh of Irish rap trio Kneecap has appeared before Westminster Magistrates' Court in London charged with a terrorism offence following an incident last November.
Mr Ó hAnnaidh, also known by his stage name Mo Chara, was charged with the offence in May.
He is alleged to have displayed a flag in support of Hezbollah at a gig in London last year but denies the charge.
The 27-year-old's legal team argues that the charge brought against him was done so outside the time limit to bring such a charge.
The judge adjourned the case and will return with a decision on 26 September.
According to London's Metropolitan Police, the terrorism offence is alleged to have happened at a gig last November at the O2 Forum in Kentish Town, north London.
The 27-year-old is accused of displaying a flag "in such a way or in such circumstances as to arouse reasonable suspicion that he is a supporter of a proscribed organisation".
What happened when Kneecap's Mo Chara appeared before court?
Mr Ó hAnnaidh has described the charge as "political" and insisted that the flag was thrown on stage.
Kneecap has also branded the charge a "carnival of distraction" from the crisis in Gaza.
Watch: People show their support for Kneecap's Mo Chara during his court appearance
A large crowd, comprising well-known activists and artists, gathered outside the court ahead of his appearance.
Mr Ó hAnnaidh's legal team includes Gareth Peirce, solicitor for WikiLeaks founder Julian Assange, and Rosalind Comyn, who has represented Extinction Rebellion protesters in court.
His team also includes Darragh Mackin from Phoenix Law, Brenda Campbell KC, Jude Bunting KC and Blinne Ní Ghrálaigh KC, who was part of South Africa's legal team in its case against Israel, accusing the country of genocide.
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