You can use the bellow code to get the creator of an event item and the user name of the current user:
EventsManager eventsManger =
//EventID variable is the GUID Id of your event item
IEvent eventItem = eventsManger.GetEvent(EventID);
CmsContentBase contentBase = (CmsContentBase)eventItem.ContentItem;
creator = contentBase.Creator;
currentUserName = HttpContext.Current.User.Identity.Name;
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