(AP Photo/Evan Agostini, file)
Heavy demand for the April 7 show at The Palace of Auburn Hills prompted organizers to add a second performance April 8, said Jeff Corey, spokesman for the venue.
About 15,000 people can attend each performance of Leno's "Comedy Stimulus Plan" show, Corey said.
Hundreds of people lined up outside the venue Monday to collect up to four tickets a person. They only had to say they're unemployed to get tickets.
Tickets were to be distributed at the Palace box office until they ran out.
Leno, host of NBC's "Tonight" show, has said the appearances are for an area hard hit by high unemployment -- especially the job losses at Detroit's struggling automakers.
Some members of the Detroit City Council have been critical of Leno's decision to perform in a Detroit suburb rather than inside the city limits. Motown star turned councilwoman Martha Reeves said last week Leno had indicated to her that he would consider a benefit in Detroit later in the year.
"If there is a second show in Auburn Hills, it's still not Detroit. I just want it to be Detroit, if it's Detroit," she said.