Over the past couple days I've managed to do a lot. At the beginning of the event I caught a wild Hitmonchan (fiiiinally), about an hour later I caught my first Kabuto, caught enough Magikarp to do the Mew quest for it, hatched a Mareep to finally get Flaaffy in my dex (fun fact, I actually caught a wild Ampharos before I ever owned a Mareep lol), caught enough Squirtle to finally get a Blastoise registered in my dex, caught a bunch of Machop to finally register a Machamp in my dex as well, same deal with Doduo to Dodrio and Voltorb to Electrode, a stranger helped me beat an Onix raid and at last got me a Steelix, found and registered a Solrock in my dex, and to top it all off a wild Lapras popped up like 20 minutes ago and I made tracks in icy cold winds to get to it. I saw another player who went after the Lapras as I was heading there, I should have said hi or something cause I've never seen anyone else openly play GO here, but oh well. I caught the Lapras at least, 2025 cp, so that was easily the highlight of this event for me.
Oh and apparently wild Gyarados can spawn too, saw that while at work last night. I didn't know the 400 candy evolutions could wildly spawn, so that was interesting to see.
So now my Kanto dex is on its way to completion. Just need a Hitmonlee, a Muk (which I saw two wild ones on the radar, but I couldnt bother to go after them at 2am), and a Kabutops. Then the rest are regionals and legendaries. This event has been amazing so far and I hope they do a Johto one later on, likely when they introduce Celebi or something.