Well.. that’s what a Zig Day is. It’s not a conference so usually there are no talks apart from showing what you worked on at the end of the day. When I go to a Zig Day I usually ask if there are any newcomers to the language and give an introduction to Zig, but that’s an informal thing.
The page about this specific event (Zig Day) mentions that they’re also meeting the evening of the day before, which is probably something you might be interested in if you travel the day before.
I will not be able to attend this Zig Day Nuremberg, but I’ve been to the previous ones and I’ve had a lot of fun.