ARROYO SECO TOURS--Sponsored by the Los Angeles...

ARROYO SECO TOURS--Sponsored by the Los Angeles Conservancy, 727 W. 7th St., Suite 955, Los Angeles; 11 a.m. to 2 p.m. Sunday; information (213) 623-CITY ($15).

CHANGING SIGNS--The Pico Rivera City Council on Monday is expected to relax the city’s strict sign laws in time for the Christmas shopping season. The 7:30 p.m. meeting will take place at City Hall at 6615 Passons Blvd.

GRIFFITH OBSERVATORY--”Music from the Galaxies,” a lecture, demonstration and concert, will be held in the planetarium theater of the Griffith Observatory at 7:30 p.m. on Monday. Tickets are $3.50 per person at the door.

LOOK AT POVERTY--Program on children in poverty in the Pomona Valley, sponsored by the Claremont League of Women Voters; Pilgrim Congregational Church, 600 N. Garey Ave., Pomona; 8:30 a.m. to 3:30 p.m. Tuesday ($10).

UNDERSTANDING ‘HOMOPHOBIA’--Program for people who want to understand the homosexual lifestyle; University Union multipurpose room, Cal Poly Pomona, 3801 W. Temple Ave., 7:30 p.m. Wednesday ($5).

WATER LECTURE--”Southern California--Will It Dry Up?”; Marian Miner Cook Athenaeum, Claremont McKenna College, east end of 8th Street, Claremont; 7 p.m. Wednesday (free).