Line Rehearsal AMENDMENT. There must be at least one (1) "line rehearsal" per production completed before the first performance of said production. The Understudy will learn lines by the first "line rehearsal". If this rehearsal is in addition to the regular rehearsal hours, the Artist will invoice the Theatre at the rate stipulated on line one (1) of Schedule “A”. The Festival shall endeavour to schedule an additional Understudy line rehearsal per production after three (3) months elapsed from the official opening.