I really enjoy participating in GameJam and do so regularly. Gamejams provide a great opportunity to improve on various skills such as concepting, rapid prototyping, and scoping. My primary GameJam team is team SparklePony.
Advent of Code - 2019
In December 2019 I participated in Advent of Code. Advent of Code is an advent callender of coding challenges where you have to complete a coding challenge everyday of the 25 days of December leading up to Christmas. I used this to learn Python and managed to complete all 25 days :)