https://webresources.gu.se/RSS_Services/Calendar_dynamic_RSS?categoryNames=&calendarIds=&fromSiteNodeId=529651&languageId=100000&startDateTime=2019-08-23&endDateTime=2019-08-30&endDateTime=2019-02-14&siteNodeId=529651&languageId=100000&categoryAttribute=eventTypes&categoryNames=Seminarieserie The top 25 events