Each side will have 20 minutes for oral argument at the hearing scheduled for August 27.
Pat Loontjer, executive director of anti-gambling group Gambling with the Good Life, is named in the lawsuit that was filed last week.
Loontjer says the measure violates the Nebraska Constitution's provision against asking voters to answer two questions in one vote. He says the amendment asks voters to approve the new form of gambling as well as how the proceeds should be divided.
Following a removal request from Gambling with the Good Life, Secretary of State John Gale announced last month that he would keep the measure lawmakers approved earlier this year on the ballot.
He says that although the language of the amendment contains more than one subject, it "connects its subjects together to be part of one general subject."