Play auditions.

Auditions for two children's roles in the Mainstage Center for the Arts summer production of

Ragtime

will be held today at Camden County College. Directors are looking for one boy and one girl able to portray children ages of 8 to 10 years old. The girl will play the role of a daughter of an immigrant in 1906, and the boy is the son of a well-to-do couple from New Rochelle in the same time period. No preparation needed; all materials will be supplied.

Play auditions in Lincoln Hall, Camden County College, 200 College Dr., Blackwood. Free. 2 p.m. Information: 856-227-3091 or www.mainstage.org.

Family nature hike.

Families can experience an outdoor adventure Saturday at Palmyra Cove. Hikers, led by naturalist Kristina Merola, will explore an array of plants and animals found in the 250-acre preserve. Binoculars are recommended.

Family nature hike at Palmyra Cove Nature Park, located off Route 73 under the Tacony-Palmyra Bridge. $15 per family; $5 per person. Free for nature park members. 9 to 11 a.m. Information: 856-829-1900, Ext 270 or www.palmyracove.org.

Music school open house.

Settlement Music School is having an open house Saturday at all six of its branches, including Camden. The United States' largest community school of the arts will open its doors for a day full of performances, demonstrations, giveaways, and lesson registrations. The event is designed to help families and individuals learn more about the opportunities for music and dance instruction.

Settlement Music School open house: 531-35 Market St., Camden (across from City Hall), 856-541-6375. Free. 10 a.m. to 1 p.m.

Shark Realm exhibit.

Check out nine new species of sharks, along with new shark shows, interactive and exhibits at the Adventure Aquarium. This is in addition to the 550,000-gallon Shark Realm exhibit, the 40-foot suspended shark tunnel, and the Touch-a-Shark exhibit. The new species you can see are: the Smooth Dogfish shark, Zebra Bullhead shark, Epaulette shark, Chain Dogfish shark; Coral Catshark; Arabian Carpet shark; Dark Shyshark, Horn shark, and Zebra shark.

Adventure Aquarium Shark Realm Exhibit at the Adventure Aquarium, 1 Aquarium Dr., Camden. $18.95 adults; $14.95 children ages 2 to 12. 9:30 a.m. to 5 p.m. Information: 856-365-3300 or www.AdventureAquarium.com.