And they are hoping that model Lisa will return to the Wicklow house she shared with the solicitor until their shock split for the bash.
"Lisa's friends would always come to the gigs so I'd say she will be there. I don't see why she shouldn't be there," Aslan guitarist Billy McGuinness told the Herald.
The band -- who celebrate their 30th anniversary together this year -- are looking forward to their upcoming charity gig.
The Ross Nugent Foundation was set up in July 2010 in honour of 18-year-old Ross who tragically passed away from a rare bone cancer called Ewing's sarcoma.
The special charity gig will be held in the Wicklow home of "solicitor to the stars" Kean, who is organising the event.
Sinead O'Connor is also being tipped to play at the concert at Drayton Manor house, which is located in Brittas Bay, after rushing to the aid of heartbroken Kean.
Last Friday saw her going out to dinner with the high-flying lawyer as she joined him and a group of close friends in private members bar Residence.
She also attended Lisa Murphy's 40th birthday party in his Wicklow mansion last September, where she delighted guests with an impromptu performance.
Gerald has been putting on a brave face since his split with Lisa and continuing with his charity work.