There may not be a contested convention, but the Republican National Convention may have a floor fight on its hands, even if efforts to change the rules fail, according to a group pressing for delegates to "vote their conscience" during next week's nationally televised roll call.

Delegates Unbound, a group insisting that delegates may already vote for the candidate of their choice as their party's presidential nominee, has set up shop in downtown Cleveland, just blocks from where those delegates will cast their votes on the floor of the Quicken Loans Arena next week.

In an interview in the group's nerve center, a room scattered with empty coffee cups and doughnut boxes, Dane Waters, the head of the group, told ABC News that even if last-ditch attempts to change the rules fail, the roll call vote on the floor of the GOP convention won't be "some quiet little rodeo."

"These individuals are extremely passionate about the right to vote their conscience," he said. "So I can't imagine that people are going to sit around and not do anything."

Members of Delegates Unbound have been working out of its office for 20 days, trying to educate delegates that if they don't want to vote for Trump, they don't have to. The Republican National Committee disagrees, saying the delegates are bound under the current rules.