It can be done to completely omit "einkaufen" and it would nevertheless be a wonderfully right sentence (while it would depart us guessing what the speaker is planning to do on the farmer's current market): "Ich gehe auf den Bauermarkt." To look at this online video remember to permit JavaScript, https://holz86521.buscawiki.com/801411/helping_the_others_realize_the_advantages_of_massiv