passing two parameter in form cant seem to figue out

Basically I have an event ID and User ID i need to pass in the form to store... however when i hit create it comes up with

Route pattern "/roles/{id}/{{id}}" cannot reference variable name "id" more than once.

However if i hit enter in the URL bar it works... so not to sure whats happening here... help would be greatful here the code.

Route file
                Route::get('racehistory/{event_id}/store/{user_id}/race/','racehistoryControlle@store'); 

Form View

{{ Form::open(array('class' => 'form-horizontal', 'method' => 'post', 'action' => array('racehistoryController@store', $user->id, $event->id))) }}

Controller - racehistoryController

public function store($event_id, $user_id)
{
    $rules = array(
        'start_event'   => 'required',
        'end_event'     => 'required',
        'pool_type'     => 'required|max:3|min:3',
        'name'          => 'required|max:35|min:3',
        'location'      => 'required|max:35|min:3',
    );

    $validator = Validator::make(Input::all(), $rules);

    if ($validator->fails()) {
        return 'form works';
    }
}