Citizens Business Bank Arena (originally Ontario Community Events Center) is a multi-purpose arena, in Ontario, California, USA. It hosts local sporting events and concerts. Construction officially began on March 7, 2007 and the arena was opened on October 18, 2008. It is suitable for indoor events, including basketball, ice hockey, ice shows, boxing, graduation ceremonies and concerts. The arena's basketball capacity is 10,832. It also seats 9,736 for hockey and its full capacity is 11,089.