Auditions for the children’s musical “Little Mermaid Jr.” will be held Tuesday from 4 to 5:30 p.m., and from 6:30 to 8 p.m. at Ayer Shirley Regional Middle School, 1 Hospital Road. The Shirley Arts! organization is holding auditions for both leading roles and the chorus; participants must have finished first grade and be younger than 18 years old to participate. The first read-through will be held June 24, from 1 to 4 p.m.; rehearsals will be from 1 to 4 p.m. during the first three weeks of July (except for July 3 and 4). Performances are scheduled for July 18 and 19. The fee is $100, with some scholarship money available; the town’s Cultural Council is providing support for the production. For more information, visit www.shirleyarts.org.