HAI550 is turning Children’s Day weekend into a nostalgic playground for grown-ups, with four days of vintage shopping, DIY workshops, and a laid-back indoor market spread across multiple floors. More than 50 vendors and bloggers will be setting up stalls, bringing everything from second-hand clothing and vintage designer finds to handmade accessories and remake pieces. Visitors can browse brands like Ralph Lauren, Patagonia, and YSL on the seventh floor, explore jewelry and crafts on the eighth, or join workshops featuring knitting, clay, and handmade art projects throughout the weekend.