A researcher asked 10 people to go car-free for 20 days. None wanted to continue
(www.brisbanetimes.com.au)
They do that in my town. Finding parking and garages and everything is not even an issue. I feel like you're more in a much more Cityfied area than I live in. Well I do live in a major match politen area I was making the comment the other day that the majority of the city I live in is more valley and suburbs than actual city. However at all of the train stops throughout the valley there is free parking. And you could even leave your car there for a few days if you wanted to. And at any of the major bus hub areas there's also large lots and free parking. They even provide random park and ride lots throughout the outer suburb areas so you are encouraged to carpool.