gistfile1.rb

class Ticket
  VENUES = ["Convention Center", "Fairgrounds", "Town Hall"]
  attr_reader :venue, :date
  attr_accessor :price
  def initialize(venue, date)
    if VENUES.include?(venue)
      @venue = venue
    else
      raise ArgumentError, "Unknown venue #{venue}"
    end
    @date = date
  end
end

puts "The venues are: #{Ticket::VENUES}"
# GENERATES ERROR: puts "The venues are: #{Ticket.VENUES}"