Amnesty International has warned Ibrahim Halawa may be sentenced to death when his case comes back before an Egyptian court this weekend.
Today marks the 777th day of the 19-year-old's detention after his arrest in Cairo in 2013. He was arrested that August while taking shelter in a mosque from protests in Cairo. He has been detained in prison there ever since.
Following numerous postponements, Ibrahim is due to stand trial again on Sunday.
His family will stage a demonstration to call for his immediate and unconditional release at the Spire in Dublin today at 3pm.
Colm O'Gorman from Amnesty International said the Dublin student may face the death penalty.
He said: "He could see himself convicted of very serious charges and facing a possible death penalty within minutes of that trial starting," he said. "Such trials often take 10 or 15 minutes in Egypt without lawyers present.
"Or, we could see yet another postponement, another agonising wait for Ibrahim and his family as he, frankly, rots in an Egyptian prison which is frankly no place that you would want anybody to be."