Split / Hvar, Croatia July 2021 and avoiding the Ultra Europe crowds

I have the opportunity to visit Split/Hvar for cheap in July 2021. I enjoy a good party but do not want to be overrun by the festival crowd. Will Split be mobbed the weekend (7/3-7/4) before the Festival (7/9-7/11)? Not sure when the festival goers would get to town. Would love time to actually enjoy the city. Any insights appreciated!