I have--in fact a few times! It has been a while though...
They march twice at day--I believe at 11 am and 5pm. There's a lot of pomp and circumstance.
As far as the car parkign, not that I recall, but it has been awhile.
We've got a reservation for Mothers Day brunch, so if you catch me after I cna let you know... There's a slight possibility we won't go though, because a friend might come stay for the weekend. She's a zookeeper, and we might take advantage of her knowledge and visit AK for a very unique perspective instead.
Anne