Are concealed weapons allowed on the Fairgrounds?
Guns are prohibited on the Iowa State Fairgrounds; with or without a valid Iowa permit to carry unless authorized by the Fair Board as per Iowa Code. Failure to comply with this rule shall be cause for expulsion from the fairgrounds and/or being charged under Iowa Code.

Quoted:
Don't go to the fair.  I like the food buts its not worth the hassel of people,parking etc.

Quoted:
Aren't the Fairgrounds one of the few places explicitly listed as somewhere you can't carry?

Only time I went to the fair, I had an auto knife in my pocket, left the gun at home. No hassles, got severely dehydrated, and left early after visiting the medical tent.

371-2.5 Public Safety—Weapons. (State Fair Grounds)

The carrying or possession by any person other than a peace officer of any weapon, such as a dirk, dagger, hunting knife, buck knife, switch blade, or any knife with a blade of three inches in length or longer, pistol, revolver, rifle, shotgun, pellet or BB gun, blackjack, billy club or any other weapon is prohibited on the fairgrounds unless authorized by the board. Failure to comply with this rule shall be cause for expulsion from the fairgrounds or being charged under Iowa Code chapter 724. Kitchen knives and others purchased at the fair must be wrapped and not concealed.

724.4  CARRYING WEAPONS.
        1.  Except as otherwise provided in this section, a person who
     goes armed with a dangerous weapon concealed on or about the person,
     or who, within the limits of any city, goes armed with a pistol or
     revolver, or any loaded firearm of any kind, whether concealed or
     not, or who knowingly carries or transports in a vehicle a pistol or
     revolver, commits an aggravated misdemeanor.
        2.  A person who goes armed with a knife concealed on or about the
     person, if the person uses the knife in the commission of a crime,
     commits an aggravated misdemeanor.
        3.  A person who goes armed with a knife concealed on or about the
     person, if the person does not use the knife in the commission of a
     crime:
        a.  If the knife has a blade exceeding eight inches in length,
     commits an aggravated misdemeanor.
        b.  If the knife has a blade exceeding five inches but not
     exceeding eight inches in length, commits a serious misdemeanor.
        4.  Subsections 1 through 3 do not apply to any of the following:
        a.  A person who goes armed with a dangerous weapon in the
     person's own dwelling or place of business, or on land owned or
     possessed by the person.
        b.  A peace officer, when the officer's duties require the
     person to carry such weapons.
        c.  A member of the armed forces of the United States or of
     the national guard or person in the service of the United States,
     when the weapons are carried in connection with the person's duties
     as such.
        d.  A correctional officer, when the officer's duties require,
     serving under the authority of the Iowa department of corrections.
        e.  A person who for any lawful purpose carries an unloaded
     pistol, revolver, or other dangerous weapon inside a closed and
     fastened container or securely wrapped package which is too large to
     be concealed on the person.
        f.  A person who for any lawful purpose carries or transports
     an unloaded pistol or revolver in a vehicle inside a closed and
     fastened container or securely wrapped package which is too large to
     be concealed on the person or inside a cargo or luggage compartment
     where the pistol or revolver will not be readily accessible to any
     person riding in the vehicle or common carrier.
        g.  A person while the person is lawfully engaged in target
     practice on a range designed for that purpose or while actually
     engaged in lawful hunting.
        h.  A person who carries a knife used in hunting or fishing,
     while actually engaged in lawful hunting or fishing.
        i.  A person who has in the person's possession and who
     displays to a peace officer on demand a valid permit to carry weapons
     which has been issued to the person, and whose conduct is within the
     limits of that permit.  A person shall not be convicted of a
     violation of this section if the person produces at the person's
     trial a permit to carry weapons which was valid at the time of the
     alleged offense and which would have brought the person's conduct
     within this exception if the permit had been produced at the time of
     the alleged offense.
        j.  A law enforcement officer from another state when the
     officer's duties require the officer to carry the weapon and the
     officer is in this state for any of the following reasons:
        (1)  The extradition or other lawful removal of a prisoner from
     this state.
        (2)  Pursuit of a suspect in compliance with chapter 806.
        (3)  Activities in the capacity of a law enforcement officer with
     the knowledge and consent of the chief of police of the city or the
     sheriff of the county in which the activities occur or of the
     commissioner of public safety.
        k.  A person engaged in the business of transporting prisoners
     under a contract with the Iowa department of corrections or a county
     sheriff, a similar agency from another state, or the federal
     government.  

Quoted:
Better than not drinking enough fluids and having to visit the medical tent to get an IV because you don't know how to hydrate.