Q:
Activities: Where are they?
i also try to find some info about this. In divinity’s reach, some NPCs say that “soon” they open the activity.
So, maybe this is a future feature.
Yes, the Kegbrawl is already in the game!
It’s in Hoelbrak (Norn main city). Marked with crossed flags if I remember right. 
It’s at a frozen lake in the north west parts.
The rest aren’t implemented yet as far as I know.
There’s a Portal to the Polymok arena in Rata Sum but it doesn’t work yet.
That closed event in Divinity’s reach is the Shooting Gallery I think.
Dunno about the rest.
I saw bottles in a bar today in Divinty’s Reach you can pick them up and have all sorts of skills that looks like a bar fight to me- but I was in a personal instance so I haven’t tried it out yet.
As for the Keg Brawl- yes it is in Hallbrak(?) and it is great fun! It took me ages to realize what side I was on, I must have kittens of a lot of players
there is something like a racetrack in Lions Arch, looks like a Moa-Race to me.
a bit disappointed that only one was available at launch, but it’s probably my own fault. Expectations were pretty high. Well, the game isn’t boring any time soon for me, so no problem I guess. ^^
they talked about 30 minigames… I wonder in which rate those are opened and if they are hold back intentionally (until most bugs are gone) or if these are simply not finished.