What creature is it that annually cleans out my sidewalk crevices overnight and leaves the debris all over the walk?

Various birds will do that while searching for grubs, worms, insects etc.  At the moment here it's nesting season so there's a lot of rummaging for suitable nesting materials going on.

If the soil between the cracks look like a small eruption, it is moles or voles.

Since I got and of the food source, the bitters have moved to eat elsewhere. It was the grubs that they were after!

In my garden its usually Blackbirds my dog used to help them now its just bids

Your local aardvark?

How wide are these crevices? There are a lot of birds which will happily dig out soil, kicking it all about the place, in the search for worms and grubs.

Check out the rare insect called "child of earth".  It lives in the southwest desert and when alarmed or threatened cries out like a baby.  As loud as a baby.  It is probably trying to dig a tunnel, but the ground is too hard.

At least it only happens once a year.

Could be rats, possums, raccoons or? What do you have in your area?