I have a model of events and city.
class Event(models.Model):
city = models.ForeignKey(City, blank=True, null=True,
core=True, verbose_name='ciudad')
Then, I wanna let the user filter the events by city. But I don't
wanna show ALL the city, because a lot can't have events attached. So,
Exist New York, Miami & Chicago, but only chnicago have events.
How get all the citys that have a event?
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