Remove gateways by event ID Please note that if you want to do this with other gateways, you will need to check the action hook in each gateway as they may well be slightly different (e.g. invoice doesn't currently have the _2 at the end).

EE Remove gateways by event ID

function htrappfae_remove_check_from_event($payment_data) {
  extract( $payment_data );
    if ( $event_id==8) { //check to see if this is the event with the ID of #8
        //echo "Event Espresso ID: $event_id"; 
        remove_action('action_hook_espresso_display_offline_payment_gateway_2','espresso_display_check' );
        remove_action('action_hook_espresso_display_offline_payment_gateway_2', 'espresso_display_purchase_order');
    }
}

add_action ( 'action_hook_espresso_display_offline_payment_gateway', 'htrappfae_remove_check_from_event',9 );