The Geneva summit is the topic of a program sponsored by Sigma Delta Chi, the Washington chapter of the Society of Professional Journalists, beginning at 6:30 p.m. at the National Press Club. Speakers include Helen Thomas of United Press International, Bill Ringle of Gannett News Service and David Hoffman of The Washington Post. Phone 546-4400.

The National Neighborhood Coalition's conference, "Look Back to the Future: Poverty and Neighborhood Action," continues today and Tuesday at the Washington Plaza Hotel on Thomas Circle. The coalition is a nonprofit membership association of more than 50 national and regional organizations that work with neighborhood groups. Phone 628-9600. TUESDAY

President Reagan flies to California to celebrate Thanksgiving with family members at his ranch near Santa Barbara.

The Commission on National Elections holds a news media briefing to discuss primaries, presidential debates, national registration day, the Election Day holiday proposal and campaign financing at 10 a.m. in the International Club, 1800 K St. NW. Robert Strauss, Melvin Laird and Ed Ney will speak. Phone Laura Whalen at 775-3176.

Thanksgiving Action on Poverty holds a briefing at 1 p.m. in the Murrow Room at the National Press Club. Participants will include Arthur S. Flemming, former secretary of the Department of Health, Education and Welfare, and Robert Greenstein, director of the Center on Budget and Policy Priorities.

The Consumer Product Safety Commission holds a news conference on toys and products frequently involved in accidents and deaths, at 10 a.m. in the Agriculture Department's Jefferson Building.

The Census Bureau reports on October durable goods, manufacturers' shipments and orders. WEDNESDAY

The Census Bureau reports on October export-import merchandise trade.

Treasury issues its monthly "budget" statement for October. No Events Scheduled Thursday or Friday