The much-awaited opening of Hennessey’s $2.1 million aquatic center is set for Monday, June 15. Hours are noon to 6 p.m. Monday-Saturday and 1 to 6 p.m. Sunday. Night swims will also be available from 7 to 9 p.m. each Tuesday, Thursday and Sunday. Admission is $2 for ages 17 years and under;