Before members of The Arc of Douglas County celebrate the organization’s 50th anniversary on Aug. 24, the Self Advocates of Lawrence group will play host to an ice cream social and free dance lessons on Tuesday.

Volunteers Rikki Endsley and Jud Kite will teach the group ’50s dance-style moves from 5:30 p.m. to 6:30 p.m. in Room D of the United Way building, 2518 Ridge Court.

From 6 p.m. to 10 p.m. Aug. 24 at Maceli’s, 1031 N.H., members of The Arc of Douglas County will celebrate a half century of providing services of case management and advocacy to people with developmental disabilities and their families.

The evening will include a ceremony honoring founding members with an upscale dinner and a sock hop. Tickets – $30 for adults and $20 for self advocates – should be purchased at least one week in advance. To buy a ticket, call Barbara Bishop at 749-0121.