So, how I actually solved it was even a bit different:

Document.objects.filter(documentType=1, 
event__eventType=1).annotate(Max('event__start_date')).order_by('event__start_date__max')

I had to use the Max function because the relationship is actually a many to 
many. Even if it was just a standard foreign key this is still an option, 
and it eliminates the problem of re-querying if you later decide to use 
other fields. 

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