The OCA Ranch Rodeo features 12 historic Oklahoma ranch teams in head to head competition for bruises and bragging rights. The OCA event is comprised of six events depicting day-to-day ranching jobs. Some call the event, "cowboys helping kids", and for good reason since the selected charity has been the Children's Miracle Network, Supporting Children's Medical Research Institute for 22 years.  In that time more than $500,000+ has been raised to help children. The event also features a trade show and kids dummy roping.…