[Rails] Forms within other object views

I'm sure I'm overlooking something really obvious, but I'm trying to
figure out how to do a form for an object associated with the current
view object.

Specifically, I have an itinerary that has events. When I'm looking at
an itinerary I should be able to add new events. My relationship
between the two is:

class Itinerary < ActiveRecord::Base
has_many :event
end

class Event < ActiveRecord::Base
has_one :itinerary
end

In the itineraries_controller, I have a show method defined like this:

def show
@itinerary = Itinerary.find(params[:id])

@new_event = Event.new
end

However, it is clearly puking on the Event.new, and I'm looking for a
good place to learn about how to work through all of these
associations. If this isn't the place, I'd love a link to where this
is taught.

Thanks in advance.
--
Melih O.

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