I'm going to have a psrty next Saturday. After classes I'm going to do shopping, I must buy a lot of food. Перед shopping

I\'m going to have a party next Saturday. After classes I\'m going to do shopping, I must buy a lot of food. (У меня будет вечеринка в следующую субботу. Я собираюсь за покупками, я должен купить много еды.) - артикль перед \"shopping\" и перед \"food\" не нужен.