Only if you are mis-informed about the law. There is no "magic" thing about gun shows and the so-called "gun show loophole" does not exist except in the minds of the uninformed.
Sales by gun dealers always require background checks while sales between private parties do not. The "loophole" is that most gun shows allow private sellers to set up a table to sell their private collection. Since those sales are between private parties, there are no background checks required. This is no different that if you were to sell your shotgun to your next door neighbor.
Actually, you would be perfectly in your rights to set up a gun show where all sellers were private parties. All sales would therefore be between private sellers and buyers and thus, no background checks would be needed. The only exception would be that the private sellers must live in the same state.
If I’m not mistaken, California gun laws require that private sales must be done through a licensed dealer. Many states obviously don’t have that requirement.