The event gave elections officials a chance to brush up on a series of what-ifs before the 2018 midterms.
Drawing new boundaries for thousands of legislative districts is about three years away, yet the political battle over redistricting already is playing out in the midterm elections.
Up to 7 percent of unaffiliated voters are returning both the Republican and Democratic ballots.
The open primary model adopted by voters in 2016 allows unaffiliated voters to cast a ballot in June's primary elections without joining a party.
Amendment 71 requires petition signatures from at least 2 percent of registered voters in each state Senate district and a current total of 98,000 valid signatures statewide.
The idea is to find strong statistical evidence that the election outcome was the correct one.
Roughly 35 percent of state legislative contests in the United States are uncontested each year. Is that good for democracy?
Some 25,000 Coloradans have registered or re-registered to vote since June.
The original request had been on hold pending a court case. The U.S. District Court in D.C. has denied the motion made by the Electronic Privacy Information Center.
About 270,000 people will be old enough to vote in a presidential election for the first time this year. How do prominent people in Colorado remember their first ballots?