Believe it or not, if you schedule your theatergoing carefully enough, it is possible to see all nine--count' em--plays that are filling Harvard stages this weekend and next. For the most part, the selection is a stampede of warhorses that you've probably seen before. Still, there should be entertainment aplenty to take your mind off of the inevitable December stress--provided you don't burn yourself out rushing from play to play.

Blithe Spirit

Written by Noel Coward

Directed by David McConaughy

At the Leverett House Old Library

December 1-4 and 8-10 at 8 p.m.

ONE of the playwright's more mature romantic comedies, this is not the typical show of Cowardice. Blithe Spirit is about a man whose marriage is threatened by the ghost of his first wife.

Brighton Beach Memoirs

Written by Neil Simon

Directed by Andrew Hill and Dan Balsam

AT the Mather House TV Room

December 2 (8 p.m.), 3 (2:30 and 8 p.m.), 8-10 (8 p.m.), (10:30 p.m.)

BRIGHTON Beach Memoirs is the first play in Neil Simon's trilogy of bittersweet autobiographical comedies with alliterative Bs in the titles. The play is about the early adolescence of a boy in an extended Jewish family in Depression-era Brooklyn.

Don't Drink the Water

Written by Woody Allen