You have been helpful, Guardian.
Concealed weapon permits, (CCW) in California are obtained by the sheriff on one's county and there is a slim to none chance that one can be obtained. People are working on that though. Sacramento County just became relaxed with issuances there. Through out the State it is lawful to openly carry, by those at least 18 years old, on your belt/holster (fully visible) as long as the gun isn't loaded. Although magazines may be loaded and carried separate from the gun in a belt holster, etc. There are certain other restrictions like not carrying within 1000' of a K-12 school and certain government buildings. On college campuses I believe one needs direct permission from the college president. California is one of more strict states, others may not be so.
It's highly recommended to research and know the laws in your area. Read the laws yourself don't just ask about them. They are available online for all jurisdictions. Also discuss at opencarry.org, there are sub-forums for each state.
There is much more to consider than can be discussed here. Get to know others with experience and learn from them before attempting any carrying.
With that aside;
As far as actually carrying; Unless your character is from the wild west it probably won't go over well. Not too many black-ops magicians are there? Instead, I recommend a friend or even two, escort you to your vehicle after each pass of the hat or get to know a nearby shop owner who will watch your blessings until much time has passed. (A lock box would be handy here.) Get to know the law enforcement officers in the area and let them know about your performances and see if they wouldn't mind making themselves visible. That's what they are there for. Paddy has a good point, weapons that are not part of the entertainment won't mix well if the audience is aware.
As the economy worsens and things get rougher all over, robberies and violent crime will increase. Busking and street vending will become more popular and for some, their means of survival. Survival is about thinking ahead.
For thinking ahead of being a potential victim;
Don't count your blessings in the open and don't head for the public restroom.
I would keep a smaller amount of bills separate from a larger amount and be willing to give up the smaller.
Carrying a wad of printed up fakes might not hurt.
Keep the wad in a drawstring pouch which will make it more difficult to open quickly and the perp. may run off with it without taking the time to look inside.
Put real bills on top and add a few coins to the mix too.
Risking possessions with tactics may be more valuable than risking one's life with force.