George Bernard Shaw's comedy "Captain Brassbound's Conversion," directed by Joseph Everingham, opens Wednesday, August 1, as the third offering of the Harvard Summer School Players' season at the Loeb Drama Center. The play, set in North Africa, features Joanne Hamlin as Lady Cicely Waynflete, celebrated British traveller, the role Shaw wrote for British actress Ellen Terry. Tom Griffin plays the tital role of Brassbound, brigand and smuggler, who is in reality the nephew of Lady Cicely's travelling companion, Sir Howard Hallam, a famous English jurist, played by Samuel Abbott.

Donald Soule's settings include a tropical garden on the coast of Morocco and an abandoned Moorish castle where Brassbound's band of thieves and cutthroats hide out. Costumes are by Lewis Smith. David Cole plays the Cockney thug, Drinkwater, with Peter Haskell as the Scottish missionary, Rankin, and Kenneth Tigar, Roger Gans and William FitzHugh are in the cast.

"Captain Brassbound's Conversion" plays nightly except Sunday through August 11th. Opening night curtain is a 8:00 o'clock with all subsequent performances at 8:30. Tickets are $1.50 and reservations may be made by telephoning UN 4-2630 from 10 a.m. to 9 p.m. daily. Loeb Drama Center is just off Harvard Square in Cambridge and is easily accessible by M.T.A.