def attendees_attributes
      return {} unless @attendees

      attendees = @attendees.map do |attendee|
        attendee.select { |k,_v| ['displayName', 'email', 'responseStatus'].include?(k) }
      end

      { "attendees" => attendees }
    end
def attendees_attributes
      return {} unless @attendees

      attendees = @attendees.map do |attendee|
        attendee.select { |k,_v| ['displayName', 'email', 'responseStatus'].include?(k) }
      end

      { "attendees" => attendees }
    end
Hash representation of attendees