All events are client-side only. If you want to use them from server-side too, you will need to register them in cl_main.lua.
As I find more usable scaleforms, I will keep this resource updated. If you know some cool scaleforms, feel free to make a PR.
You can find all the relevant information, and how to use every scaleform on the Wiki
Creating issues and pull requests are always appreciated! I started this resource because I really like working with scaleforms, and I want future devs to be able to access these scaleforms without any inconvenience.