Comedians from across the country will take part in Glasgow Stands Up For The Clutha on December 22, while a series of musicians will present Folk For The Clutha on January 10.
The concerts have been arranged with the Clutha's comedic and folk music history to raise funds for the victim's families. Both events will take place close to the Clutha, with the O2 Academy hosting the comedy night and the folk night being held at St Andrew's in the Square, Saltmarket.
Alan Anderson, principal organiser of the stand-up show, said he had been in constant contact with comedians offering their support.
Describing the Clutha as "an institution" for Scottish comedy, he suggested the upcoming benefit gig could be the "biggest of the year". He said: "As soon as I started asking comedians to help, I was inundated."
Despite the possibility of two more headline names, the current line up includes acts such as Janey Godley, Des McLean, Des Clarke, Gary Little, Mark Nelson, Bruce Morton, Stu Who, Scott Agnew, Susie McCabe, Billy Kirkwood, The Wee Man, Ashley Storrie and music from River City's Tom Urie.