Stanislav

jQuery(document).on('almComplete', function(event, response) {
  jQuery('.your-slider-class').slick('unslick');
  jQuery('.your-slider-class').slick();
});

<div id="slider" class="slider" style="visibility: hidden;">
//
</div>

window.addEventListener('load', function() {
  var slider = document.getElementById('slider');
  slider.style.visibility = 'visible';
});