What do you need to know?
Don't go!
Just kidding...
If you want to know what my advice is, feel free to message me...
And no, for those of you who believe I am crazy (crazy is relative) my advice does not consist of sneaking weapons onto airplanes.
My advice would simply be, get a California approved .380 or .32 pocket pistol, check it in with the airline, get it when you get off the plane, and then go about your business.
Unless you're planning on causing trouble, trying to enter a place guarded by metal detectors, or you get drunk/high/stupid/etc and wind up in a confrontation with police, you ought to be fine.
The way I see it, you can be charged/tried/imprisoned/released dozens of times, you only get one time when it comes to being killed. Depending on what area you're going to be in, do what you believe is the most reasonable conclusion based upon risks/rewards, or costs/benefits.
Do a cost/benefit analysis.
The cost of carrying concealed (without a CA issued permit) in CA is that you run the risk of major legal trouble. The risk of encountering trouble varies with how well you observe traffic laws, how well you avoid picking fights, how well you avoid being drunk/loud/etc.
The benefits of carrying concealed (without a CA issued permit) in CA, are that you are able to defend your life, or the life/dignity of your wife, should the need arise.
I cannot tell you what to do, I can simply lay out the analysis as best I see it, and leave it to you to make that decision which you conclude is best for yourself and your family. However, that said, I believe I know what I would do in your place.
If worse comes to worse and you get arrested, claim to be part American Indian, scream racism, talk about how you are entitled to carry a weapon on the land of your ancestors, and make a big stink out of things. Again, it's your call... Do what you think is best.
Pick the option that yields the most benefit at the lowest cost.