July 26--Wednesday

411--Last day for study program change of withdrawal (with complete adjustment of fees). 9 a.m.-12;30 p.m., 1:30-4 p.m., 20 Garden St.

July 27--Thursday

Lecture: Dance Center Lecture Series--Norman Walker, Director of the Dance Department at Adelphi University, and Director of the Jacob's Pillow Dance Festival. 2 p.m., Agassiz Living Room. Free.

Lecture: Thursday Speaker Series--"Student Involvement in Politics." Lawrence DiCara, President, Boston City Council. 4 p.m., Science Center C. Free.

Films: Center for Middle Eastern Studies--The Empty Quarter, Grass--A Nation's Battle for Life, and Egypt's Struggle for Stability. 7:30, Science Center D. Free.

July 28--Friday

4II--Last day to change from graded to Pass/Fail, or from Pass/Fail to graded status. last day to drop a course, or to change from credit to non-credit or audit within the same course (with 50 per cent adjustment of tuition). 20 Garden St.

Arts Competitions: Deadline for entry to Poetry and Black and White Photography contests. Submit entries to Dean's Office, Lehman Hall basement.

July 30--Sunday

Memorial Church Service, 11 a.m. The preacher will be the Reverend Charles C. Hefling, Jr.

August 2--Wednesday

Centennial +3: Celebration of the 103rd Summer Session. Features music, dance, drama and refreshments. All afternoon, Harvard Yard. Free.

Concert: Harvard Glee Club. Winds up Centennial +3 celebration. Final appearance of F. John Adams as conductor. 7 p.m., Sanders Theater. Free.

Play: Harvard Summer Repertory Theater--The Country Wife, by William Wycherly. 8 p.m., Loeb Drama Center. $5, $6, $7.50. Through August 19 (Tues.-Fri. 8 p.m., Sat. 5 p.m. and 9 p.m.).