Over 1000 demonstrators rallied in the rain at M.I.T. yesterday afternoon, but tere were no occupation of administrative offices and no arrests.

Instead, demonstrators marched through the administration building to the Center for International Studies (CIS) and then on past the Instrumentation Labs, chanting and carrying a large NLF flag.

The demonstrators-led by the November Action Coalition (NAC), a coalition of about 25 Boston-area radical groups-called for immediate with-drawal from Vietnam, support of the NLF, and an end to war-related research.

The group met at Kresge Plaza outside M.I.T.'s student center at noon, and, after a short rally, inarched through the administration building to the CIS. the original target of yesterday's demonstration.

The CIS. as announced Monday night, was closed for the day, forestalling the NAC's plans for disruption. No attempt was made to enter the building.

Instead, demonstrators-who called the CIS closure a victory-read an indictment of the Center from the "People's Revolutionary Grand Jury and Tribunal."

Plans originally called for the occupation of offices in the administration building. But when the NAC returned to that building from the CIS, occupation was voted down.

NAC leaders generally felt that the call for a vote was a mistake. "Occupation had already been decided upon." one spokesman said. "There was no need to vote again." Those voting against the occupation were largely members of M.I.T.'s Science Action Coordinating Committee (SACC), a group which supports the NAC demands but is regarded as more moderate.

At a mass meeting of over 600 demonstrators in the M.I.T. Student Center late last night, members of the November Action. Coalition discussed the effects of yesterday's actions and their plans for today's demonstrations.

NAC leaders indicated that today's protests, tentatively, scheduled to center around the M.I.T. I-Labs, will increase the level of militancy in the four day action.

The first demonstration is expected to begin at 6:15 a.m. today outside the I-Lab No. 5 where principal research. on the MIRV missile system is conducted. At 3 a.m. this morning it appeared that demonstrators would agree to set up "obstructive pickets" around three gates and two entrances to the laboratories, but final plans were still uncertain.

Other proposed actions, however, call for returning to many of the sites of yesterday's protests.

The Center for International Studies and the administration offices, both closed during yesterday's demonstrations, will operate today on a normal basis, M.I.T. officials announced yesterday evening.

Earlier in the day, as NAC marched toward the CIS, about 500 demonstrators led by SACC descended on the administration offices of the second floor of the main building. Kenneth Wadleigh, vice-president of the university, explained that President Howard W. Johnson was not in his office.

After some futile discussion with Wadleigh and with provost Jerome Wiesner, most of the group left the corridor outside Johnson's office. About 175 SACC members gathered in the lobby of the building and listened to speakers while the rest went on to the CIS.