Yeah, you can. 👍
You can even open old projects/game examples in the engine, and copy/paste snippet of your events into your jam game. (We allow people to copy over full extensions, so a few events are not a big deal.) A while ago I sent in the discord server to people who aren't sure how much is fair to copy from an old project: https://discord.com/channels/258623956158906368/630511209778774037/1222146236325...
I hope that helps. 👍