Yes, it's quite easy tho change the way Sitefinity formats content item's URls. Please take a look at this forum thread
, which contains an explanation and screenshot demonstrating the location of the settings. Please note you'll need to restart the application to apply the new changes. In your case, I believe a urlFormat of /[EventStart]/[UrlName] would suit the desired functionality. If you have any additional questions, please let us know.
the Telerik team
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system and vote to affect the priority of the items