Алекс17,
select и option
document.querySelector("body > div.content > div > div.sf-content > div:nth-child(3) > div > div.event-blocks > div:nth-child(3) > div > div.row.mb25 > div > form > div:nth-child(6) > div.filter-value > select > option:nth-child(4)").selected = true;