We will move forward with the event on the adjacent public land using UT as the backdrop," said Murdoch Pizgatti, a founder of the gun rights groups Come and Take It Texas and DontComply.com.

4:10 p.m. update: A University of Texas spokesman says the planned mock mass shooting demonstration this weekend would be considered criminal trespass if participants do not leave when asked.

American-Statesman file photo: Matthew Short of Victoria, public relations director with Come and Take It Texas and DontComply.com, and president of both groups, Murdoch Pizgatti of Plano, pose with weapons outside the Bastrop Police Department last summer.