NEW ORLEANS — It’s never too early to plan. Clean Show planners Riddle & Associates announced this morning at an exhibitor meeting that the show will return to Las Vegas for its next appearance, with dates set for June 6-9, 2011.This will be the fifth time that the Clean Show has been held in “Fabulous” Las Vegas. With this schedule, Las Vegas ties Chicago for most shows, and surpasses New Orleans, which has hosted four shows including 2009. Atlanta and Orlando have hosted the show twice, while Dallas took on the task once.The Clean Show last came to Las Vegas in 2007. That show attracted 14,667 visitors, including 1,948 people from countries outside the United States. Total exhibit space was 227,950 net square feet, with 484 companies exhibiting.There are only a limited number of venues that can host the Clean Show due to the show’s size and unique utility requirements, Riddle & Associates, the show’s management firm says.