Since there's nothing up on the Bislett website yet
it's not illogical to say it's a work in progress. Like all the big Euro meets, there's still a lot of negotatiing time left before they know what their fields are likely to look like, and when you're trying to craft the best possible show for TV, you don't cast your schedule in stone until as late as possible.
But last couple of times I was there the snowball throw went off around 18:00. (really!)