It’s the first I’ve heard of it, but, from the Washington Examiner:

In a preemptive move to put state political leaders on notice, gun advocates are planning protests Sunday at all 50 state capitals to warn elected officials that they won’t sit idly by and watch their Second Amendment rights be destroyed.

“We’re trying to be very proactive right now,” said Eric Reed, president of Gun Rights Across America, which is organizing the rallies. “I don’t want to see the gun grabbers get a jump on our constitutionally protected rights,” he told Secrets.

The protest is called “Stand Your Ground” and takes place at “high noon.” The phrase “stand your ground” is also the nickname given to laws that let citizens used deadly force when threatened.

Not much more info at the sponsor’s link other than a graphic (scroll down a bit on this homepage) so if any of you have more info, leave it in the comments.