LAS VEGAS — With the Legislature set to begin in a little more than two weeks, and with debate raging nationally about gun control, an invitation-only event for Nevada lawmakers hosted by the National Rifle Association at a Las Vegas shooting range drew criticism Friday from a liberal advocacy group.“The timing of this is suspect,” ProgressNow Nevada chief Brian Fadie said of the Saturday event the NRA is casting as an opportunity for lawmakers to learn about guns, gun rights and gun laws. Fadie noted that the event comes a little more than a month after a gunman killed 20 …