OK, apparently a rally has already been organized by or associated with "Liberty On The Rock", a libertarian social group. The link to the page is on facebook. If you can't see it, i'll post the text here.

https://www.facebook.com/events/234582726675522/?ref=3

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Join us as we fight against gun control.

Pro-Gun Rally to Take Place on Session’s First Day:

With increasing talks about gun control in Colorado, Guns for Everyone,
a local and somewhat of a newcomer to Colorado’s pro-gun scene, will host
a pro-gun rally at the capitol on opening day of the legislative session.

“Evil is a consequence of freedom, the alternative is slavery,”
said Isaac Chase, local freedom crusader and friend of Guns for Everyone.
“It is a nice theory that we can legislate ourselves into a completely safe world,
but we can’t and that is why it is important we fight for the few freedoms we still have.”

The main focus of the rally is gun freedom, but Guns for Everyone is a strong supporter
of anything freedom, so this is more about freedom than simply guns.

Edgar Antillon, co-founder of Guns for Everyone and former state house candidate, said
this was not just about guns but more importantly about freedom.
“We can debate until we’re blue in the face about gun statistics, but gun ownership is more
about freedom. I’m not comfortable with all that freedom has to offer – marijuana, alcohol, abortion,
but I’d rather be uncomfortable than be a slave to the government.”

Both Chase and Antillon disagree with Gov. Hickenlooper that there needs to be a debate about guns.
“There is nothing to debate, my freedom is not up for discussion,” said Antillon.

The rally is scheduled to take place at the capitol on January 9th at 1 p.m.