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Required Fields or Default values in lightbox for Units in weekly view

I'm using shared events successfully. At the moment, I have a select drop down list configured on the lightbox for the Unit Name.
When I use the Unit View, this field correctly defaults to the Unit I have created the event on.
On the week view, the field is by default empty and I can save events without setting this field, but as this means the event is not associated with any Unit, I want to stop users from forgetting to complete this field.
Is there a way I can make a field required before allowing the record to be saved? Alternatively, is it possible to set a default value?

thank you,
Rose

>>Alternatively, is it possible to set a default value?

scheduler.attachEvent("onEventCreated",function(id){
      scheduler.getEvent(id).some_property = default_value;
      return true;
})