public async Task AddToEvent(Guid eventId, AddMemberToEventRequest request)
{
var @event = await _eventRepository.Get(eventId);
EnsureEventExists(@event);
var member = await _memberRepository.Get(request.MemberId);
EnsureMemberExists(member);
_memberRepository.AddMemberToEvent(@event, request.MemberId);
await EnsureMemberAddedInDataBase();
}
