Maastricht Carnival is the city at its most playful, with costume-filled streets, parades, and nonstop brass-band music for three days. Expect street bars, sing-alongs, and a packed city center where locals go all-in on the tradition. It is festive and lively rather than polished, so come for the atmosphere and stay for the people-watching. Dress up if you can and plan for busy evenings.