Comedian PJ Gallagher and The Chase's Anne Hegarty will lead Saturday's Ray D'Arcy Show line-up.
The Dubliner, 43, will join Ray ahead of his new TV show The Big DIY Challenge.
The Naked Camera star, who most recently starred in The Young Offenders, will tell why volunteering with the RNLI has changed his life.
Meanwhile, The Chase's Governess is to talk about life on I'm A Celebrity: Get Me Out Of Here and being diagnosed with Aspergers.
And disability rights campaigner Joanne O'Riordan is in the RTE studio to chat about student life and working as a sports journalist.
Ray will also speak with Stephen Travers who is a survivor of the Miami Showband Killings, in which two people died in Co Down in 1975.
Actor Aidan Gillen and his partner Camille O'Sullivan are to perform a duet of Roy Orbison's In Dreams in aid of Focus Ireland.
The Ray D'Arcy Show is on Saturday at 10.20pm on RTÉ One.
