Procure pelos JAM's que existem por aí, como JAM, Code JAM, etc.

Esses aqui são da área de jogos https://globalgamejam.org/ https://v3.globalgamejam.org/2022/jam-sites/global-game-jam-curitiba-2022-pucpr https://ludumdare.com/ https://nordicgamejam.com/

Programação Topcoder: https://www.topcoder.com/ Codeforces: https://codeforces.com/ Atcoder: https://atcoder.jp/ CodeChef Ensina mais há competições também https://www.codechef.com/

$LeetCode: https://leetcode.com/ Google: https://codingcompetitionsonair.withgoogle.com/ ICPC (International Collegiate Programming Contest): https://icpc.global/

A palavra-chave Hackathon pode ajudar também.

Hacker $HackerRank: https://www.hackerrank.com/ Hacker Cup: https://www.facebook.com/codingcompetitions/hacker-cup