Services are offered at regular chapels around San Diego County. They are on Sundays only at varying times listed at www.churchofjesuschrist.org
Everyone is invited to the Sunday services at the church buildings, however there's a certain spiritual preparation required to participate in the temple services, you can contact the missionaries and they'll be glad to help you
No. The temples are only open to the public when they're first built. But anyone is welcome on the temple grounds.
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