Butler High School's Aquaettes synchronized swimming team will present its show "Aquaettes on Demand" at 7:30 p.m. today, Friday and Saturday at the senior high school pool.

The students will be performing synchronized swimming routines to TV theme songs. The group is made up of 36 students in grades nine to 12. The coach is Dacia Como.

FRAZER TWP, Allegheny County — Wagman Observatory star parties will start at about 8:35 p.m. May 21 and 22 at Nicholas E. Wagman Observatory. Deer Lakes Regional Park.The parties are held weather permitting and are sponsored by the Amateur Astronomers Association of Pittsburgh. Call 724-224-2510 or visit www.3ap.org for more information.

PITTSBURGH — Single tickets will be available at 9 a.m. Monday for the farewell engagement of Andrew Lloyd Webber's "The Phantom of the Opera," directed by Harold Prince.The show runs Aug. 25 to Sept. 19 at Benedum Center, 719 Liberty Ave.Single tickets range from $24 to $125 and will be available by calling 412-456-4800 or online at www.phantom.pgharts.org.

PITTSBURGH — Pittsburgh International Children's Theater presents its 24th annual children's theater festival from May 12 to 16 in the green spaces surrounding Schenley Plaza and the University of Pittsburgh and at various indoor theaters in Oakland.The schedule includes:• "The Man Who Planted Trees," U.S. premiere tour by the Puppet State Theatre Company of Scotland.• "Bathtime" by Théâtre Bouches Décousues of Quebec, Canada.• "Aga-Boom," created by Dimitri Bogatirev, Russia/USA.• "Droplets," U.S. premiere by La Società Della Civetta of Italy.• "Beppe's Elephant," a world premiere by the Zany Umbrella Circus of Pittsburgh, in a dream circus in which an Italian circus artist believes he can be the first to train an elephant to walk on a tight wire.• Mapapa Acrobats from Kenya.For tickets and more information, call 412-456-6666 or visit www.pghkids.org.During the festival, free outdoor activities and performances will take place weekdays from 9:30 a.m. to 2 p.m. and on the weekend from 10 a.m. to 5 p.m.

PITTSBURGH — First Fridays at the Frick outdoor concert season begins June 4.The concerts take place on the first Friday of each summer month on the lawn in front of Clayton, the former home of Henry Clay Frick, at the Frick Art & Historical Center at 7227 Reynolds St., Point Breeze.Concerts begin at 7 p.m. Donation is $5; children are admitted free.Picnic dinners will be available from The Café.The schedule includes:• Grande Romanza, vocalists with piano accompaniment, June 4• Beppe Gambetta, acoustic guitarist of Italy, July 2• Dane Vannatter, cabaret/jazz vocalist, Aug. 6• White Tie Group, jazz ensemble, Sept. 3.For more information, call 412-371-0600 from 9 a.m. to 5 p.m. or visit the website, www.frickart.org.