undefined method `id' for nil:NilClass

   <%= link_to event.title, event %>
  | <%= link_to "delete", event, method: :delete %>

   <%= form_for(current_user.relationships.build(event_id: @user.id)) do |f| %>
   <div><%= f.hidden_field :event_id %></div>
     <%= f.submit "Sign up", class: "btn btn-large btn-primary" %>
   <% end %>

class RelationshipsController < ApplicationController

      def create
       @relationship = Relationship.new(relationship_params)
       @user = User.find(params[:relationships][:event_id])
       current_user.follow!(@user)
       respond_to do |format|
       format.html { redirect_to @user }
       end
     end
    end

def new
     @event = Event.new
   end

   private

   def event_params
     params.require(:event).permit(:title, :Venue, :Time, :Date)
   end

def new
  @user = User.new
  @event = Event.new
end

def new
  @user = User.find(1)
  @event = Event.new
end