Is this show going by ADS rules? These are the same classes the Iowa State Fair offers, and they go by the Carriage section rules of ADS. This means wood wheels on your cart, a whip with a tip that reaches the horses shoulder, and a dress code: brown gloves, long sleeve blouse or jacket, hat, and lap robe. You also need russet (brown) reins even on a black harness.
The Open show in Texas this weekend has these 3 classes too, but not going with a dress code. They DO require the wood wheels though, because they also have a pleasure driving class for "bike tires" or pnuematic tires.
A review of the classes:
Working--a pleasure driving class in which entries are judged on the suitability of the horse to give a pleasant drive. To be shown both ways of the arena at a walk, slow trot, working trot and strong trot. To stand quietly, both on the rail and while lined up, and to rein back (back up). All entries chosen for a workout may be worked both ways of the arena at any gait requested by the judge, and may be asked to execute a figure of eight and/or perform other appropriate tests.
To be judged:
70% performance, manners, and way of going
20% on condition and fit of harness and vehicle
10% on neatness of attire
Reinsmanship--pleasure driving class where entries are judged primarily on the ability and skill of the driver.
To be shown at the walk, slow trot, working trot and strong trot. Drivers shall be requested to rein back. All entries chosen for a workout may be worked both ways of the arena at any gait requested by the judge, and may be asked to execute a figure of eight and/or perform other appropriate tests.
To be judged:
75% on handling of reins and whip, control, posture and overall appearance of driver
25% on the condition of harness and neatness of attire
Cones--a timed class through pairs of cones. There are tennis balls on top of the cones, and there is a 5 second additional penalty for every ball knocked off. There are a couple of ways to run this class--as a pattern everyone does the same way; as a "pick your route" where you can go through in any order but can only go one time through each set (ie you can't circle through a set you've already done to take a shortcut); or progressive cones where each pair is closer and closer together.
The cone width are supposed to be set based on the width of each drivers wheels, or it isn't fair for the big guys.