Private individuals are not allowed to call the Colorado Bureau of Investigation and request a background check. They MUST use a licensed dealer who MUST maintain records. There is no provision for the transfer of firearms should federal licensees either be unavailable or simply refuse to conduct background checks. Licensed dealers are aiding the competition from private sales, which does not benefit them. The threat to freedom of assembly is very clear.
Gun shows are also political gatherings and are often used to advocate political viewpoints.
Any threat to these gatherings is an attack on freedom of assembly and freedom of speech, cherished rights under the First Amendment of the United States Constitution. This initiative is being marketed as preventing the sales of firearms to criminals, but it does not significantly impact such sales. The firearms purchased and used in the Columbine High School attack would still have been sold if this law were in place. The transfer of firearms to minors without their parents permission was outlawed in the year 2000 legislative session. The legislature did act and closed the legal loophole that allowed Robin Anderson to transfer weapons to the Columbine murderers.