A holiday networking mixer for Tucson's advertising and public-relations community takes place from 5 to 7 p.m., Tuesday, Dec. 20. The ticket price includes live entertainment, appetizers and a first beverage from the cash bar. Ticket prices vary; visit aaftucson.com to register and for more information. Participating organizations are the American Advertising Federation Tucson, Ad2 Tucson, the Public Relations Society of America Southern Arizona Chapter and the Tucson American Marketing Association.