Eugene Ionesco's "Man with Bags" will have its world premiere at Towson State University, Towson, Md., Sept. 14. A preview is scheduled the previous night. The adaptation is by Israel Horovitz, the young American playwright best known for "The Indian Wants the Bronx." There will be 17 performances ending Oct. 1.

Carly Simon and Michael Decker are contributing incidental music and the translation is by Marie-France Ionesco. Preview tickets will be $3 and $4; all other performances Tuesdays through Sundays, will be $5 and $6. Reservations may be made at (301) 321-2244 or (301) 321-2787.

The Romanian-French Ionesco's "The Bald Soprano" appeared in 1949 and since then there has been a score of others including "The Lesson," "The Chairs," "Rhinoceros," "Exit the King" and "Macbett." "Man with Bags" chronicles one man's quest to find his home and "his attempt to move from adult experience to childhood innocence to primal experience."

This premiere is a definite coup for Towson State.

Lynn Fontanne last night boarded a British Airways plane at Dulles bound for London. Originally her plan was for a Concorde flight, but the air-traffic controllers' slowdown in England cancelled that one. Accompanying her is the Lunts' longtime lawyer, Donald Seawell, president of The Denver Post and husband of Eugenia Rawls, currently standby for Mary Martin in "Do You Turn Somersaults?"

Since Alfred Lunt's death early this month, Fontanne's friends have been rallying round. Laurence Olivier has been a houseguest and the London theater world today is pouring flowers into her suite at the Dorchester. Back to work? If the right part comes along, that could be.

During last week's American Theater Assn. convention in Chicago the Charlotte B. Chorpenning Cup was awarded Adventure Theater's Flora B. Atkin for her folkloric plays "of universal social and aesthetic value." To follow her "Tarradiddle Tales," planned for Israeli production this fall, Atkin has a new one for this fall's In-School Players of Adventure Theater based on Judaic folklore.

Reduced in income, the D.C. Black Rep is reducing its name to The Rep and starting its season with a one-man production by E. L. James. "Faces of Love," scheduled for Sept. 22. The group also plans six other productions, all previously tested this summer in its Readers' Theater. Sole drawback: no budget for any productions after "Faces of Love." Anyone with cash willing to help should contact Frank Ruffin at 291-3903.

With over 30,000 pieces of mail to sort from "A Chorus Line," the Kennedy Center will not be ready to open box office ticket sales for the musical until Tuesday, Sept. 6. It's thought there will be some to sell through the wicket, but no more than four will be sold to a customer in an effort to avoid black marketeering.

Wolf Trap's annual International Children's Festival will be held Labor Day weekend, Sept. 3, 4 and 5 from 11 a.m. to 5 p.m. daily . . . Adventure Theater's "Peter Pan" is playing in its Glen Echo Park Theater Thursdays through Sundays at 7:30 p.m.; reservations at 320-5331 . . . Archaesus Productions' "Encore!" by Sharon Doyle, will be performed next Tuesday at New York's Lincoln Center.

Mary Martin will be the National Press Club's luncheon guest Wednesday . . . That noon Michael Rupert, Eric Berry and Thelma Carpenter of the Opera House cast will discuss "Pippin" at the Kennedy Center's free symposium, noon in the AFI Theater . . . The Hayloft Dinner Theater apprentices will take over the theater but not the kitchens for a repeat of their "When You Comin' Home, Red Ryder?" at 7:30 p.m. No meal, mind you, but admission is free . . . The Georgetown Workshop Theater will hold auditions for Langdon Mitchell's "The New York Idea" Sept. 12 and 13 at 7:30 p.m. in Christ Church Parish Hall, 3116 O St NW; details at 332-3282 . . . The Theater School has moved to its new headquarters, the former Paramount Pictures office and screening room, 306 H St. NW. Curricula in acting, directing, technical theater and design will begin next month and some scholarships are available; details at 638-2813 . . .