In celebration of Social Security’s 75th birthday, U.S. Rep. Jackie Speier will visit four senior centers for cake and conversation: 1 p.m. to 2 p.m. today, Pacifica Senior Center, 540 Crespi Drive; 9 a.m. to 9:45 a.m. Friday, San Bruno Senior Center, 1555 Crystal Springs Road; 10 a.m. to 11 a.m. Friday, Burlingame Recreation Center, 850 Burlingame Ave.; 11:30 a.m. to
12:30 p.m. Friday, San Mateo Senior Center, 2645 Alameda De Las Pulgas.