public async Task CreateAsync(Guid id, string title, string description, string category, DateTime date, string city, string venue)
{
var activity = await _activityRepository.GetByIdAsync(id);
if (activity != null)
{
throw new InfrastructureException(HttpStatusCode.Conflict, ErrorMessage.ActivityAlreadyExists);
}
activity = Activity.Create(id, title, description, category, date, city, venue);
await _activityRepository.AddSingleAsync(activity);
}