So, they just announced the theme:
the SDL 2024 Discord Game Jam’s theme is islands. Itch.io page will be up later this week. Use SDL2 or SDL3 to render. Deadline is last day of August at midnight PST.
That’s BST+8 and CEST+9, if what I’ve read is correct.
Render_Geometry are the two functions you need to be looking at for rendering.