What sort of extra activities/events do data scientists do?

I’ve heard about ML competitions and data engineering hackathons, as well as pitching and entrepreneurship contests that my computer science classmates talk about. There’s even the challenges, projects, and tools flair on this sub.

What *all* is out there? I’m just a curious undergrad lol

challenges competitions computer computer science data data engineering datascience data scientists engineering entrepreneurship events extra flair hackathons pitching projects science scientists talk tools