Legal Question in Personal Injury in California

The hotel is private property. Its management is entitled to bar you from the premises, even if it has no good reason to do so. You have no legal right to regain access, so you cannot sue successfully.

You could plausibly have a defamation claim against the event staff who reported you. But your damages seem too slim to justify bringing such a lawsuit. Even if you win, it would not require the hotel to let you return.

Your recourse is persuasion, not litigation.

I do not know your race, national origin, sexual orientation, etc. but, if you believe that you were barred because of one of these categories, you might have a valid claim for unlawful discrimination. The Equal Employment Opportunity Commission or the California Department of Fair Employment and Housing would be where to file a complaint.

Mr. Geagan is right that discrimination based on membership in various classes (race, gender, religion, etc.) is illegal. The question did not suggest to me that such discrimination happened here. But if it did, you may have a legitimate claim.

Who gets sued here

Nobody.

Businesses have the right to refuse service and access to anyone, with or without cause, unless it is a civil rights violation. Your text does not apparently invoke those protections, and you signed admitting and agreeing as to 'conduct' being the reason.