The term 'curtain raiser' refers to a short performance or event that takes place before the main event. The crossword solutions for this term are SCENEO (6 letters), OPENER (6 letters), ACTI (4 letters), and SCENEI (6 letters). SCENEO is an abbreviation of 'scene one, ' which is the first scene in a play or performance. OPENER is a word used to describe something that begins or starts an event. ACTI is an abbreviation of 'act one, ' which is the first act in a play or performance. Finally, SCENEI is an abbreviation of 'scene one, ' which is the first scene in a play or performance.