Benskarush

Among the human population of Uncambel, there is a traditional holiday celebrating children. Originally it was meant to celebrate elvish  children, in an attempt to trick them into being a little more sane than their parents, but this gradually changed to include all youngsters, and a lot of sugar.

History

Once upon a time, a queen of Uncambel had a glorious idea: to somehow get the elvish children away from their parents at a young age and then train them up to be sane members of society.
This did not work, for a variety of reasons. First of all, the elvish parents very much objected to losing their children, and antagonizing a rather unstable element of the population is generally considered to be unwise. Second, the concept of nature versus nurture is a fascinating psychological discussion, but there are certain traits that elvish children inherently possess that made it difficult for this nameless queen to manage her scheme.
In any case, before anyone could talk her out of it, she crafted a massive carnival designed to lure in elvish children and steal them away. Most of her advisors predicted a bloodbath, or at the very least some kind of massive property damage. Instead, the carnival went well. The bloodbath came after, once the children were kidnapped. (There are very few military actions in history in which one side has been more clearly the right side. Even Deorma sided with the elves on this one.)
But since the festival itself was a success, the idea was expanded on and gradually became a much celebrated day for children.

Execution

Nowadays, Benskarush is one massive, centrally-located festival. Not found in the capital of Uncambel, but rather as near to the center of the country as can be figured. Since magic occasionally renders things a bit fuzzy, the location changes from year to year.
In any case, it's a giant carnival featuring sweets and varying levels of noise and large fluffy animals, and depending on the year, various forms of entertainment.