Since the Freaks are firmly behind the Ring Master, you might as well talk to the Normals, the problem is you have to talk to someone with some pull with most of them, and Remarkable Randal is the only one who has that in any great capacity and getting him to side with Charley is out of the question.

At least directly.

It's possible you could talk with Madam Orbec and get her to convince Randal to change his stance since he follows anything she says; also she's less likely to throw something at your head when she sees you approach.

You head towards Madam Orbec's tent, which has an air of creepiness surrounding it. You enter the tent and immediately get your usual welcome.

"Geek! Begone from this place! Do not assault the spirits with your foulness!" Madam Orbec commands.
"They're dead; I don't really see how my smell can affect them."
"It's not your odor that offends the spirits, it's your aura! We do not want you in our presence! Away with you, we have no wish to be involved in your underhanded dealings!"
"How do you know what I'm here for?"
"Fool! I am Madam Orbec! I see all that the spirits see! You're working with that miscreant Charley in an attempt to take over the Carnival and you're hoping to influence me so that I may in turn influence Randal to convince the normals to side with him."
"Well since you know…Madam?"

Madam Orbec begins to clutch her head and writhe on the floor talking to herself.

"Yes. But no! Maybe? Perhaps. If he can pull it off. Is he capable? I doubt it. We must try. Whatever, just get him out of here!"

Madam Orbec suddenly stops and slowly sits up.

"You need to expose those of the small craniums."
"What?"
"The Pinheads. You need to show their true nature to the public."
"True nature? What're you talking about? Why"
"That is all the spirits have told me, their reasons are not to be questioned, but I have been advised to help you in your treacherous endeavor if you accomplish this objective. Now leave and do not return unless you are successful."

At this point Madam Orbec seems to go into a cationic trance. You take your opportunity to leave and ponder what the hell her cryptic ramblings were about. All you know for certain is that you have to do something to the Pinheads. Expose their true nature, though you can't imagine what that could be.

You could try spying on them and see what you can find out, or maybe a more direct approach would work.

You direct approach

You can't think of anything else to do, so you wait around for the Pinheads to come running around the Carnival like they usually do. When you see them gleefully playing catch with a baseball with each other, you insist on joining in

The Pinheads look a little bewildered by your actions at first, and when you actually get a hold of the ball and toss it back at them, they start getting noticeably angry. A few of them start pushing you and attempting to trip you up. You continue to antagonize them by "playing" with them. Until one of them says something out loud surprising everyone.

"GET THE FUCK OUTTA HERE GEEK! YOU'RE FUCKING STINKING UP THE PLACE!"

This one hostile sentence shows a coherency that the Pinheads have never displayed before, and shouting it in public for the rest of the Carneys to hear has outted them.

"Fucking Pinheads can talk!" someone shouts.

At this point the Pinheads start arguing with themselves and attempting to cover up their mistake, but its too late now. You slip away and head back to Madam Orbec.

When you get to Orbec's tent, she's talking to herself as usual (Or the "spirits" rather)

"No, I don't like that. Well if you moved a little more. NO! YOU CAN'T FUCK ME IN THE ASS! Oh fuck it then."
"Um, am I interrupting something intimate?"
"The Geek returns! And I see you have been successful in your mission. The spirits thank you and you can be sure the Normals will be on your side when the time comes. Now leave us we are discussing something important."
"Wait, can you at least tell me why you…I mean the spirits wanted the Pinheads exposed?"
"I suppose. Does he need an answer? Probably not. Then why tell? You're right." Then Madam Orbec answers you directly.
"No, now leave before we change our mind."

Not wishing to undo your work, you leave and head back to Charley, who you see walking around looking for you.

"Hey there you are Geek! What's all this I've been hearing about you fucking around with the Pinheads? You're supposed to be doin' shit for me, I hope you've been making progress in that little endeavor."
"I have. I got the Normals to side with us."

Charley chuckles heartily and tells you to be ready after the show because the revolution is coming after the rubes leave. Not wishing to run into the Ring Master before hand you hang around Charley's still which isn't too pleasant since you have to endure Ajax's abuse while Charley goes off to make his preparations.

Then show time arrives, everything goes pretty much the same except the Ring Master looks a little distracted the entire time and the Pinheads don't show up at all, apparently their exposure caused some trouble with other Carneys (All of them Normals) who didn't like the fake act they were doing just to get paid more and taking money out of the pockets of performers who had real talents. (Tricking rubes is one thing, but fucking over other Carneys is frowned upon… if you get caught)

You but the real show begins aftterwards

A dark moonlit night.

Charley confronts the Ring Master with his army of midgets behind him as well as Ajax. The Ring Master has Atlas, and his usual allies, the Freaks are hanging in the darkness ready to strike if necessary. Most of the Normals though are nowhere to be seen.

"Your time has come Ring Master! No longer will you exploit us! I'm taking over!"
"And you all feel this way? You'd rather follow this criminal who'll be corrupt? You really think he's doing this out of some noble moral code? Obviously you must be blind if you don't see that rule by this degenerate will be worse than anything you THINK I'm doing…but I leave it up to you…"
"It won't work Ringy, I got more in common with my people than you do! Blood is thicker, and yours is going to run everywhere if you don't peaceably leave…I'm giving you this one chance you pale she-male."
"Not likely, I have my own friends as you know."

The Ring Master whistles and his Freaks show up, but Charley doesn't look impressed.

"Geek?"
"Sorry, Ring Master, but we made a better deal." You say and show up with a bunch of Normals behind you, and then Randal shows up on the other side with a bunch of Normals behind him as well.
"I see. So you've all decided to throw your lot in with petty criminal activity. I'm glad to see your hypocrisy show its true face Randal, and Geek, I'm very disappointed in you. Very well, if I die this day, it'll be beside those who are the true heart of Carnival! ATTACK!"

The battle ensues, though it's not really a battle. A few of the Normals side with the Ring Master, but most of them are on Charley's side. The only thing that makes the battle last longer is the fact that the Freaks are fierce fighters. Atlas and Ajax lock horns, and while Atlas nearly kills Ajax, Randal does a couple of his magic tricks and blinds Atlas with a bright light, giving Ajax enough time to kill him.

On the side lines watching, is Pervus and his clown gang masturbating to the carnage.

Finally in the last moments Charley laughs as he stands over the Ring Master's body which is now lifeless with Charley's sharp stick through its heart; the last "Freak" to die. Meanwhile you were hiding during all this, but Charley calls you out.

"Hey Geek! Come out you fuckin' coward! We won!"
"Yeah come out, you fucking useless piece of shit! I'm too tired to do anything to you right now." Ajax adds.
"…I'm here Charley."
"Good, unzip the Ring Master's pants."
"What?"
"Unzip the Ring Master's pants; I wanna see what the hell he or she was packing. I have a bet going with Ajax and we wanna see who won."

You're a little hesitant, but your crouch over the body and start unzipping the Ring Master's pants. A crowd begins to form around you. Normal and Midget alike.

"Come on come Geek, we ain't got all fuckin' night!" Ajax says while kicking you in the ribs.

You pull down the underwear…

"EEEEEEEEEEEWWWWWWWWW!" the crowd shouts in unison.
"Holy shit!" you say falling back.
"Ha ha, I knew it! I fucking won!" Charley chuckles.
"Shit! Fuck!" Ajax shouts and starts beating you to take his frustrations out.

"Alright you lot, I want all these bodies cleaned up and disposed of before we head out to the next town, and Salina I want YOU in my new trailer to help me celebrate this glorious victory!"

And so begins the reign of Charley the Ringmaster. Under his guidance midgets run everything and the Carnival doesn't so much resemble a Carnival as it resembles a mobile grifting ring. While regular carnival activities still abound, they're more of a cover than anything. In time though problems occur. Randal and Charley begin to come into conflict as Randal begins to regret his decision to side with him as well as his disapproval of what's become of the Carnival. Another division begins to occur, but one on a smaller scale as Charley's corrupting influence has infected most of the remaining Carneys at this point. Things really come to a head when Ajax suspects Sasha of having an affair with Randal. Eventually Randal, a few of his remaining "followers" AND Sasha are all killed in the middle of night and their bodies dumped in the river. Lacking any more "true talent" or even sideshow freaks, the Carnival is disbanded entirely and Charley and Ajax set up headquarters permanently in a sleazy small town where they primarily run the place. Proving that crime does pay.

You on the other hand don't do so well. While the Carnival was still around, you were routinely abused by Charley or Ajax more so than you normally were. When the Carnival disbanded you didn't really have anywhere else to go, so you became the town drunk. Not really needing you anymore and having moved on to more important things, Charley forgets all about you, which leads to one dark rainy night when Ajax comes across you sleeping behind one of his bars. Not being reined in anymore, he does to you what he's always wanted to do.

He beats you death, laughing the whole time.