Hey Victor! Welcome to the forums and thanks for reaching out. 🙂
Good question. Events do share the same native WordPress tags as posts. So, if you tag an event with something like “BBQ” then posts they can be grouped with posts that use the same “BBQ” tag.
Whether the events show up in your theme’s slider largely depends on whether that slider supports custom post types. If that’s the case, then pulling from the same tag should work. If not, however, then it sounds like support for custom post types would need to be built in.
Does that makes sense? Will that work for you? Please let me know.
Cheers!
Geoff