Make it a pedestrian, bike, and other non-car modes of transportation city. Inexpensive parking outside of town, inexpensive or free public transportation into town. Reduce vehicle lanes, like taking 4th down to 3 lanes (one lane each way and left-turn lane). No right-on-red anywhere. Raised crosswalks. Reduce speed limits. Have police walk downtown neighborhoods instead of driving, maybe with Japan-style police kiosks. More public bathrooms and make them nice. Plan for inclement weather better; kicking people out of festival spaces with no place to shelter when thunderstorms or tornadoes roll through is not safe. More accessibility.
— my responses to what would make Chattanooga a better place to host visiting friends and family