Portorož Auditorium hosts several festivals, including the Piran Days of Architecture and the Festival of Slovene Film. It also collaborates with local festivals such as the Primorska Summer Festival, Koper-Capodistria and with the Slovene opera houses. Musical events are held here as part of the Festival of Chamber Music Piran and the Festival of Sea and Sun Melodies, along with other concerts of popular and classical music and musicals.
Portorož Auditorium comprises a large conference hall of 540 square metres with a capacity of 500 removable seats and four meeting rooms with a capacity of 20 to 100 people (White Room 130 square metres, Green Room 90 square metres, Red Room 65 square metres, Blue Room 65 square metres), plus an open air theatre of 2,500 square metres with a capacity of 1,800 seats. The atrium is also used as a reception venue.