What: The "World-Famous Mermaids of Florida's Weeki Wachee Springs" will perform a live show of aquatic marvel in the Great Ocean Tank. Shows will last approximately 20 minutes. Photo opportunities, educational programs and family-friendly stations will be available during and after the shows.

When: 11 a.m., 1:30 p.m. and 3 p.m.

Where: South Carolina Aquarium, 100 Aquarium Wharf, downtown Charleston

Price: Included with general admission price.

More Info: 577-FISH or scaquarium.org

What: Tricounty Family Ministries will offer free medical assessments today. Free lunch, groceries, clothing and prescription assistance are also available.

When: 9:30 a.m.-1 p.m.

Where: Tricounty Family Ministries, 3349 Rivers Ave., North Charleston

Price: Free

More Info: 747-1788 or tricountyfamilyministries.org

What: The Charleston Symphony Orchestra League's 37th Annual Designer Showhouse is an antebellum villa located in historic Harleston Village. The property, now transformed into a showcase of the latest trends in interior design, is open to the public and guests can enjoy an exclusive boutique, designer sales and alfresco dining in a "secret garden."

When: 10 a.m.-4 p.m.

Where: CSOL Designer Showhouse, 67 Rutledge Ave., downtown Charleston

Price: $20

More Info: 723-0020 or csolinc.org

What: Author and activist Julia Hill will speak on her life and work, particularly the two years she spent living in a California redwood tree to protest diminishing old-growth forests.

When: 7 p.m.

Where: Physicians Memorial Auditorium, College of Charleston, 3 College Way, downtown Charleston

Price: Free

More Info: 953-7532 or sustainability.cofc.edu/initiatives/planning-and-integration/student-projects.php