def get(self, request):
     participant = Participant.objects.get(
         Q(email=request.user.username) | Q(email=request.user.email)
     )
     event = participant.event.select_related()[0]
     calculator = Calculator(event)
     return Response(
         status.HTTP_200_OK,
         {
             "event"            : event,
             "participant"      : participant,
             "amount"           : calculator.amount(),
             "participantAmount": calculator.participantAmount(participant)
         }
     )