How do you get the scheduler to display a validation message in red next to the control that has the error?  I'm getting an alert with the errors to display per an example but that doesn't look very professional.  See attached image. 

Hello Matt,

The error message you shared looks like it was generated on the server. Displaying server-side messages as validation error is not supported and requires a custom solution. We currently do not have an example matching your criteria, however I would recommend checking this Code Library project, which shows how similar behavior could be implemented for the Grid widget. I believe the example would help you implement the same for the Scheduler widget as well.

Regards,
Alexander Popov
Telerik