KringleCon relates to SANS‘ Holiday Hack Challenge (HHC), which happens yearly around the Christmas time. You can find more information about the event here: https://www.sans.org/mlp/holiday-hack-challenge/
It does not matter if you are an InfoSec newbie, a Pro or somewhere in-between like me, there are challenges for everyone and a lot of information and fun. Have a look and enter the HHC, if you’re stuck somewhere, feel free to use my walkthroughes. If you have questions or a better solution somewhere, reach out to me.
Here you can find a list of all my past submissions:

Snow-maggedon Best Creative Answer that is Technically Correct awarded (recorded as Ben K.) In my fourth year, I wanted to …

A Holiday Odyssey – Geese A-Lei’ing! Super Honorable Mention awarded (recorded as Darkander) In the third year, I improved the …

Golden Rings Honorable Mention awarded (recorded as Ben [Darkander])
In the second year of my participation, I wanted to improve the …
In the second year of my participation, I wanted to improve the …

KringleCon 4: Calling Birds Super Honorable Mention awarded (recorded as Ben Krueger)
2021 was the first year I took part. I …
2021 was the first year I took part. I …