The Cowlitz Ballroom at ilani is a flexible 22,400-square-foot multi-use facility with full lighting, production, sound specialists and customized catering services. The convention center can host groups of up to 2,500 people. This venue perfect for epic concerts, headlining comedians, world-class entertainers and more. Find the Cowlitz Ballroom conveniently located 20 minutes North of Portland International Airport. Many of our guests come from Portland, Warren Pioneer, La Center, Baker, McNulty, and surrounding cities in Washington and Oregon.