https://webresources.gu.se/RSS_Services/Calendar_dynamic_RSS?categoryNames=openingCeremony&calendarIds=&fromSiteNodeId=529651&tipFriend=true&tipUrl=http%3A%2F%2Fwww.gu.se%2Fomuniversitetet%2Faktuellt%2Fkalendarium%2F%3FstartDateTime%3D2018-12-12%26endDateTime%3D2018-12-12%26siteNodeId%3D529651%26languageId%3D100000%26categoryAttribute%3DeventTypes%26categoryNames%3DopeningCeremony%26tipFriend%3Dtrue%26tipUrl%3Dhttp%253A%252F%252Fwww.gu.se%252Fomuniversitetet%252Faktuellt%252Fkalendarium%252F%253FsiteNodeId%253D529651%2526languageId%253D100000%2526startDateTime%253D2018-12-12%2526endDateTime%253D2018-12-12&startDateTime=2018-12-12&endDateTime=2018-12-12&languageId=100000 The top 25 events