KOHELET—Rabbi Jack Riemer lectures on "Kohelet: The Book of Despair and Cynicism," at 10 a.m. at Congregation Beth El, 8660 Gilman Drive, La Jolla.  Single ticket: $10 Beh El members, $15 non-members. Series tickets for July 23, July 30, Aug. 6, Aug. 14), $20 members, $30 non-members. Reserve by July 20. (858) 452-1734.

DIABETES—Dietician Janice Baker presents a program, "Know Your Numbers," focusing on detection, prevention and treatment of diabetes, at 10 a.m. at Ner Tamid Synagogue, 15318 Pomerado Road, Poway. (858) 513-8330.

RALLY FOR ISRAEL —Chabad of University City hosts a rally in support of Israel at 11 a.m. at  3813 Governor Drive, San Diego. (858) 455-1670

MARTIN BUBER—Madrikha Toby Dorfman of the Humanistic Jewish Congregation discusses the works of philosopher Martin Buber from 2 to 4 p.m. at the Lanakai Mobile Home Park, 6550 Ponto Drive.  Ticket: $5.  (858) 549-3088.

COMMUNITY RALLY FOR ISRAEL—United Jewish Federation and more than 20 synagogues and community agencies stage a rally for Israel at 2:30 p.m. at the Lawrence Family Jewish Community Center, 4126 Executive Drive, La Jolla (858) 571-3444.