The RIAO-OPTILAS Conference has been held in:

• Tandil, Argentina, on September 3-7, 2001
• Isla Margarita, Venezuela, on October 3-8, 2004
• Campinas, Brazil, on October 21-26, 2007
• Lima, Peru, on September 20-24, 2010
• Porto, Portugal, on July 22-26, 2013
• Pucón, Chile, on November 21-25, 2016
• Cancún, Mexico, on September 23-27; 2019
• San José, Costa Rica, on March 27-31, 2023