Improv night set at BLTA Night of Improv, featuring unscripted randomness and including audience participation, is planned for 7 to 9 p.m. Saturday at Butler Little Theatre, One Howard St.Activities will be hosted by Shannon Donovan. Admission is $5 at the door. Visit bltgroup.org.

It’s save-a-snowball timePITTSBURGH — Save some of the snow to participate in the Carnegie Science Center’s annual “Snowball Day” celebration on the summer solstice.Visitors who make a snowball this winter, save it in their freezer, and take it still frozen to the science center on June 20, the first day of summer, will be able to choose what they pay for general admission.In addition, visitors will be able to launch their snowballs into the Ohio River, weather permitting.

Bassoon concert setSLIPPERY ROCK — The Slippery Rock University Bassoon Choir will present a concert at 7:30 p.m. Tuesday in the Swope Music Building’s recital hall.The guest artist will be Pittsburgh Symphony contrabassoonist Jim Rodgers.

Phipps hosts Congo festPITTSBURGH — Phipps Tropical Forest Congo Festival from 11 a.m. to 4 p.m. Saturday will celebrate culture and ecology with African-inspired activities free with admission.Regional-inspired food tastings will be provided by Café Phipps.Admission is $15 for adults, $14 for senior citizens and students, and $11 for children ages 2 to 18. Visit phipps.conservatory.org.

Art Center has drawing classButler Art Center will host a Botanical & Floral Drawing workshop with Marianne Hilke from 10:30 a.m. to 4 p.m. May 22.Cost is $52, and sign up is due by May 15.Hilke’s early art education was begun in Pittsburgh at The Ivy School of Art and then continued at the Rhode Island School of Photography. She studied art and developed a passion for painting in Rome. While living in southern California, she attended classes at art schools, galleries and museums and took private lessons.Register by calling the Art Center at 724-283-6922 or e-mailing the education coordinator at artcenter.education@gmail.com.

Carved in Ice festival arrivesThe Butler A.M. Rotary presents the Butler Carved in Ice festival on Saturday in Diamond Park.The festival will feature ice sculptures, a chili cook-off, vendors and music.The event is free to attend. It will cost $5 for the chili samples.Temperatures above freezing should not pose a problem, organizers said.

Skating show set on synthetic icePITTSBURGH — The Hillman Performing Arts Series at Shady Side Academy continues with Winter Ice Solstice, a winter-themed figure skating show performed on synthetic ice at 7:30 p.m. Saturday at the Hillman Center for Performing Arts, 423 Fox Chapel Road.Family-friendly pre-show activities begin at 6:30 p.m.Tickets are $30 for adults, $24 for senior citizens and $16 for children age 18 and younger and are available at www.thehillman.org.