Nothing VW / race related that I know of, but there's always some multibrand car / bike get-together going on for a couple of hours.
Most of them quite a bit from the city but maybe that's ok.
Thursdays at Nifsta / Gottröra
https://m.facebook.com/Motorträffar-på-Nifsta-Gård-125549657471925/timeline
I've been to this one a few times. A classic car dealer (Nifsta classic cars) has opened in the area since the last time I was there. Never been there so no idea about opening hours, the amount of cars and so on.
https://m.facebook.com/NifstaClassicCars/http://mobil.blocket.se/stores/nifsta-classic-cars