Think of it as Thursday and Sunday.
Thursday in Kelowna is fine. Not the greatest physical site, but ideal for being centrally located for the bulk of the local autocross population.
Sundays require a bigger site so that we can hold something resembling a "real" autocross. Not mandatory to be in Vernon. At this point I'd take anything from Osoyoos to Kamloops as long as it's a big, safe location.
Vernon race track was used years ago by the Kelowna corvette club. The track has had noise complaint issues in recent years. Last I heard they were only allowed to run a set number of events - I forget how many, but less than 10. Obviously we can't pay enough to replace a Cascar event. Honestly it's not the greatest autocross venue anyway.... walls leave marks that don't buff out