Later, a fruit seller (some say a vendor of shrimp noodles) set up shop under the tree. This opened the door for the gradual formation of an outdoor vendors 'market. The Japanese government clamped down on them a number of times, but crowds only grew. In the end, the government reached an agreement with the vendors, legalizing them and naming the area the Taipei Peddlers Traffic Circle Night Market.
之後，有一水果攤（一說蝦仔麵販）至樹下設攤販賣，逐漸形成露天攤販區，日本政府曾多次取締，但人潮不減反而增加，最後日人遂與攤販協議組織了「台北行商組合圓環夜市場」，營業時間從下午 5 點到 12 點，並以搖鈴為訊號，成為一個合法的夜市。