How to display a field of a referenced entity in views contextual block?
The solution is a two step solution, but first you need to decided if you are going from Parent to Child or Child to Parent. 

Background info

If you are going from Parent to Child, you setup a relationship using the "referenced" variable.

If you are going from Child to Parent, you setup a relationship using the "referencing" variable.

To make life simple for myself, when I specify the relationship, I also using the Administrative Option on the Reference Window and enter a more understandable name for the relationship.  In you case, since I would make the Admin Name Event reading Organizer or something like that.


Setup a relationship for Event reading Organizer in the Relationship
field under the Advanced tab.
Once you have related your Event content type to the Organizer
content type, you should now be able to see the Organizer fields
appear in your list of available fields.  Select the fields from the
Organizer content type that you want to appear in your view and hit
Apply. Here is the CRITICAL part, once you have defined a
Relationship, a new drop down menu (Relationship) will appear on the
Configure field windows.  For any fields that is in another table,
you MUST choose the appropriate relationship for the field. In your
case, you would choose the Event reading Organizer relationship. 
This relationship instructs view to go Organizer table and bring
back that field.  If you do not specify the relationship in the
Configure field windows, this will not work.


Attached is a copy of the Configure field with a relationship.  Note: In your example, you would want the referenced variable. But in my example, I was working with the referencing variable. Please do not let that confuse you.  Just image the word in the relationship is referenced.



If you have any questions, please post them here and I will respond.