Sitefinity has a static method of SystemExtensions - ToLocal().The method gets the default time zone set under Administration >Settings. If there is no value set there we use TimeZoneInfo.ConvertTime. In both the case the method returns DateTime which should be accepted by RadScheduler or RadCalendar controls.
RadScheduler works with appointments, so basically you need to create a new appointment on the same date when the event starts. There is also a server side event AppointmentInsert
that you can use to get access to the Appointment that will be created
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